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Subject: Geography

  • Eta Aquariid Meteor Shower and how it can be spotted

    Why in the news?

    • The Eta Aquariid meteor shower, an annual event, will reach its peak on May 5 and 6.
    • This meteor shower is a result of Earth intersecting with the debris trail left by Halley’s Comet during its orbit.

    Halley’s Comet

    • Halley’s Comet is a short-period comet visible from Earth every 75–79 years.
    • It was last seen in Earth’s skies in 1986 and was met in space by an international fleet of spacecraft. It will return in 2061 on its regular journey around the Sun.

    What are Meteoric Showers?

    • Meteors, fragments of dust, rock and ice, are expelled from comets during their celestial orbits around the sun.
    • The Earth’s atmosphere heats these space rocks as they descend, leaving luminous streaks of gas in their way.
    • NASA’s records confirms existence of over 30 meteor showers annually.

    Origin of Meteor Showers:

    • Meteor showers originate from comets, remnants of the solar system’s formation composed of dust, rock, and ice.
    • Comets orbit the Sun in highly elliptical paths, and as they approach, they heat up, releasing gases and dust to form a glowing head and a tail stretching millions of miles.
    • When Earth traverses through the debris left behind by comets along their orbital plane, we witness meteor showers.

    About Eta Aquariids

    • Known for their rapid speed, Eta Aquariid meteors produce long, glowing tails lasting several minutes.
    • Observers in the Southern Hemisphere can witness approximately 30 to 40 meteors per hour during the peak, while those in the Northern Hemisphere may see around 10 meteors per hour.
    • They seem to originate from the Aquarius constellation, hence the name ‘Eta Aquariid.’

    PYQ:

    [2014] What is a coma, in the content of astronomy?

    (a) Bright half of material on the comet

    (b) Long tail of dust

    (c) Two asteroids orbiting each other

    (d) Two planets orbiting each other

  • Mapping: Garo Hills

    Why in the news?

    • Geological Survey of India (GSI) explorers have made a breakthrough, uncovering ancient fossils in Tolegre, South Garo Hills of Meghalaya.
    • It is speculated that the fossils could be linked to the genera Rhodocetus or Amulocetus (now extinct), considered ancestors of modern whales.

    About Garo Hills

    • The Garo Hills, located in Meghalaya, are part of the Garo-Khasi range, one of the hill ranges in the northeastern region of India.
    • They are situated in the western part of Meghalaya, bordering Bangladesh to the south and west.
    • The terrain of the Garo Hills is rugged and hilly, characterized by dense forests, steep slopes, and deep valleys.
    • The Nokrek is highest Peak, which stands at approximately 1,415 meters (4,642 feet) above sea level.
    • The climate in the Garo Hills is typically humid subtropical, with heavy rainfall during the monsoon season, which usually lasts from June to September.
    • Numerous rivers and streams, including the Brahmaputra, Someshwari, and Jinjiram rivers crisscross this region.
    • The region is also known for its picturesque waterfalls, such as the Pelga Falls, located near Tura, the largest town in the Garo Hills.
    • The Nokrek National Park, located within, is recognized as a UNESCO Biosphere Reserve and is home to various endangered species, including the Asian elephant and the red panda.
    • The Garo Hills are inhabited predominantly by the Garo tribe, one of the major ethnic groups in Meghalaya.

     

    PYQ:

    [2013] Consider the following pairs:

    1. Nokrek Bio-Sphere Reserve : Garo Hills

    2. Logtak (Loktak) Lake : Barail Range

    3. Namdapha National Park: Daphla Hills

    Which of the above pairs is/are correctly matched?

    (a) 1 only

    (b) 2 and 3 only

    (c) 1, 2 and 3

    (d) None

  • Mapping: Hopen Island in the Svalbard Archipelago

    Why in the news?

    Researchers disclosed that one of Norway’s Hopen Island in the Svalbard Archipelago witnessed its first walrus death due to Bird Flu (H5N1).

    About Hopen Island in the Svalbard Archipelago

    • Hopen Island is situated in the southern part of the Svalbard Archipelago, between the Barents Sea and the Greenland Sea.
    • The island covers an area of about 47 square km, making it one of the smaller islands in the Svalbard group.
    • The landscape mainly consists of low-lying tundra, rocky outcrops, and coastal cliffs.
    • Like the rest of Svalbard, Hopen Island experiences a harsh Arctic climate. Winters are long, dark, and extremely cold, while summers are short and cool.
    • It serves as an important breeding ground for seabirds such as guillemots, puffins, and kittiwakes. Polar bears are also occasionally spotted on the island, along with walruses, seals, and Arctic foxes.
    • It is uninhabited and largely inaccessible to humans due to its remote location and extreme weather conditions.
    • Historically, Hopen Island has been of strategic importance due to its location between the Barents Sea and the Greenland Sea.

    H5N1 Bird Flu: Details

    • H5N1 originated from a virus outbreak on a goose farm in China in 1996 and has since evolved into a highly pathogenic strain.
    • The virus quickly spread from Europe to Africa, Asia, North America, and South America, and most recently, it reached mainland Antarctica.
    • H5N1 is a subtype of the influenza A virus that causes severe respiratory disease in birds, known as avian influenza or “bird flu”.
    • Influenza A viruses are classified by subtypes based on the properties of their surface proteins, with H5N1 being one subtype.

    How widespread is it?

    • The virus has affected birds in over 80 countries, resulting in mass culling of poultry and wild birds.
    • Furthermore, it has now begun infecting mammals, including seals, sea lions, and marine mammals.
    • While humans rarely contract bird flu, those at risk are typically individuals who have extensive contact with infected birds at poultry farms.
    • Bird flu first broke out in Maharashtra in 2006.
    • The H5N1 virus led to the culling of millions of poultry so as to contain the virus. But it has resurfaced from time to time.

     

    PYQ:

    [2014] Which one of the following pairs of islands is separated from each other by the ‘Ten Degree Channel’?

    (a) Andaman and Nicobar

    (b) Nicobar and Sumatra

    (c) Maldives and Lakshadweep

    (d) Sumatra and Java

  • [PREMIUM] To the South Pole – Antarctica

    Why in the news?

    The Antarctic Treaty has sparked debates among policymakers, scientists, and the public, as they weigh the balance between environmental conservation, economic interests, and geopolitical concerns in Antarctica.

    About Antarctica

      • Antarctica is the fifth-largest continent, covering an area of approximately 14 million square km.
      • It is situated entirely within the Antarctic Circle, with its geographic center near the South Pole.
      • It is the coldest, driest, and windiest continent on Earth.
      • The interior of Antarctica is a polar desert, receiving very little precipitation, mostly in the form of snow.
    • The Antarctic Ice Sheet is the largest single mass of ice on Earth, containing approximately 70% of the world’s freshwater.

    Geographical Features:

    Description
    Mountains
    • The continent is home to several mountain ranges, including the Transantarctic Mountains.
    • Vinson Massif is the highest peak at 4,892 meters (16,050 feet) above sea level.
    Ice Shelves Large floating ice shelves extend along the coast, formed by glaciers flowing from the interior, crucial for stabilizing the Antarctic ice sheet.
    Glaciers Numerous glaciers flow from the high interior to the coast, including Pine Island Glacier and Thwaites Glacier, among the largest and fastest-moving in the world.
    Icebergs
    • Glaciers calve off large chunks of ice, forming icebergs of various sizes.
    • Antarctic Iceberg A-68, which broke off from the Larsen C Ice Shelf in 2017, was one of the largest recorded.
    Plateaus Much of Antarctica’s interior consists of high, flat plateaus covered by ice, reaching elevations over 4,000 meters (13,000 feet) above sea level.
    Ice-Free Areas Despite being predominantly ice-covered, some ice-free areas exist along the coastlines and in the Antarctic Peninsula region, supporting limited vegetation and wildlife.

    Territorial Claims on Antarctica:

    The countries with territorial claims in Antarctica are:

    1. Argentina: Claims a sector of Antarctica known as Argentine Antarctica.
    2. Australia: Claims the Australian Antarctic Territory.
    3. Chile: Claims a sector of Antarctica known as Chilean Antarctic Territory.
    4. France: Claims a sector of Antarctica known as Adélie Land.
    5. New Zealand: Claims the Ross Dependency.
    6. Norway: Claims a sector of Antarctica known as Queen Maud Land.
    7. United Kingdom: Claims a sector of Antarctica known as the British Antarctic Territory.
    8. United States: Claims a sector of Antarctica known as the Marie Byrd Land.

    India’s Antarctic Outreach

    • Initiated in 1981, India’s Antarctic Program, managed by National Centre for Polar and Ocean Research, encompasses multi-disciplinary research expeditions.
    • With the establishment of research bases like Dakshin Gangotri (1983) (now decommissioned), Maitri (1989), and Bharati (2012), India contributes significantly to Antarctic exploration.
    • Notably, India’s presence in Antarctica includes a Post Office established in 1984, facilitating communication and research logistics.

     

    PYQ:

    [2011] The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole?

    (a) Presence of prominent tropospheric turbulence; and inflow of chlorofluorocarbons

    (b) Presence of prominent polar front and stratospheric’: Clouds; and inflow of chlorofluorocarbons

    (c) Absence of polar front and stratospheric clouds; and inflow of methane and chlorofluorocarbons

    (d) Increased temperature at polar region due to global warming.

  • Taam Ja’: World’s Deepest Blue Hole

    Why in the news?

    Researchers have made a discovery in Mexico, uncovering the world’s deepest blue hole, known as Taam Ja’ Blue Hole (TJBH).

    What are Blue Holes?

    • Blue holes, such as TJBH, are formed in coastal regions with soluble bedrock, such as limestone, marble, or gypsum.
    • Water percolates through the rock, dissolving minerals and widening cracks, ultimately leading to the formation of sinkholes.
    • Famous examples: 410-foot Great Blue Hole in Belize, the 663-foot Dean’s Blue Hole in the Bahamas and the 328-foot Blue Hole in the Red Sea near Dahab, Egypt.

    About Taam Ja’ Blue Hole (TJBH)

    • TJBH extends at least 1,380 feet (420 meters) below sea level, making it the deepest known underwater sinkhole in the world.
    • It is located in Chetumal Bay off the southeast coast of the Yucatan Peninsula.
    • It was first discovered in 2021, was originally thought to be 900 feet deep.
    • This discovery surpasses the previous record-holder, the Sansha Yongle Blue Hole in the South China Sea, by an impressive 480 feet.

    Research Expedition and Findings

    • Scientists utilized a conductivity, temperature, and depth (CTD) profiler to collect data about the environmental conditions within the blue hole.
    • Despite reaching depths of 1,640 feet (500 meters), the CTD profiler was unable to reach the bottom of TJBH, indicating its remarkable depth.
    • Data from the profiler suggested the presence of different water layers within the blue hole, with conditions resembling those of the Caribbean Sea at depths below 1,312 feet (400 meters).

    PYQ:

    [2017] In the context of mitigating the impending global warming due to anthropogenic emissions of carbon dioxide, which of the following can be the potential sites for carbon sequestration?

    1. Abandoned and uneconomic coal seams.

    2. Depleted oil and gas reservoirs.

    3. Subterranean deep saline formations.

    Select the correct answer using the code given below:

    (a) 1 and 2 only

    (b) 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

  • Why the Thar Desert on the borders of India and Pakistan is getting greener?

    Why in the News?

    Rajasthan’s barren Thar Desert may turn green, says a recent study in the journal Earth’s Future.

    Thar Desert

    • The Thar Desert is the 18th largest subtropical desert globally and is one of the most densely populated deserts.
    • Approximately 40% of the human population in Rajasthan resides in the Thar Desert.
    • It extends from the Sutlej River and is bounded by the Rann of Kutch, the Aravalli Mountains, and the Indus River.
    • About 85% of the Thar Desert is located in India, with the remainder in Pakistan.
    • In India, it spans across Rajasthan, Gujarat, Haryana, and Punjab as well.
    • Civilizations are believed to have thrived in the Thar region around 50,000 years ago across the extinct Saraswati River.
    • The Desert National Park (home to the endangered Great Indian Bustard, desert fox, desert cat, blackbuck, and Indian gazelle) is situated in the Thar Desert in the northwest Indian state of Rajasthan.

    Why is the Thar desert getting greener?

    • Climate Change Effects:
        • Alteration of Weather Patterns: Climate change is causing shifts in rainfall distribution in the thar desert area.
        • Potential for Vegetation Growth: The increased precipitation could provide favorable conditions for vegetation growth, contributing to the greening of the desert.
    • Indian Monsoon Dynamics:
        • Westward Extension of Indian Monsoon: The Indian monsoon, known for bringing heavy rainfall to eastern India, is now extending further westward into regions like the Thar Desert.
        • Impact on Moisture and Rainfall: This change in monsoon dynamics could lead to increased moisture and rainfall in the desert region, facilitating the growth of vegetation.
    • Expansion of Indian Ocean Warm Pool (IOWP):
        • Influence on Monsoon Patterns: The Indian Ocean Warm Pool (IOWP) influences monsoon patterns and rainfall distribution over the Indian subcontinent.
        • Westward Expansion due to Climate Change: Climate change is causing the IOWP to expand westward, potentially resulting in increased rainfall over semi-arid regions like the Thar Desert and promoting greening.
    • Water Management Practices:
        • Contribution to Greening: Effective water management practices, such as rainwater harvesting and irrigation techniques like johad, kuis, and kunds, may be playing a role in the greening of the Thar Desert.
        • Utilization of Water Resources: By harnessing and efficiently utilizing available water resources, local communities and authorities can support vegetation growth and ecosystem restoration efforts in the desert.
    • Introduction of Irrigation  
      • Commercial Cropping: Irrigation was introduced during British colonial rule in the 19th and 20th centuries to convert arid and semi-arid ecosystems into cropland.
      • Restrictions on Grazing: The right to graze animals was restricted to landowners who cultivated crops, leading to the transformation of nomadic pastoralists into sedentary agro-pastoralists.

    PYQ:

    [2018] Which of the following leaf modifications occur(s) in the desert areas to inhibit water loss?

    1. Hard and waxy leaves
    2. Tiny leaves
    3. Thorns instead of leaves

    Select the correct answer using the code given below:

    (a) 2 and 3 only

    (b) 2 only

    (c) 3 only

    (d) 1, 2 and 3

    [2020] The process of desertification does not have climate boundaries. Justify with examples.

    [2013] Major hot deserts in northern hemisphere are located between 20-30 degree north and on the western side of the continents. Why?

  • Anticyclones, hanging even now over India, link warming to heat | Explained

    Why in the news?

    The record warming of 2023 has so far not been fully explained since it was much warmer than expected just from the superposition of El Nino on global warming.

    About Anticyclone:

    • An anticyclone is a weather phenomenon defined as a large-scale circulation of winds around a central region of high atmospheric pressure, clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.

    The link between ElNino and Anticyclone: 

    • El Nino events can lead to the formation of anticyclone events. During El Niño, the weakening or reversal of the Walker circulation and strengthening of the Hadley circulation caused warm ocean water to develop in the central and east-central equatorial Pacific.

    The link between anticyclone and heat 

    • Stability and Weather Patterns: Anticyclones are areas of high pressure in the atmosphere characterized by descending air, which stop the cloud formation and precipitation. This stable air mass tends to promote clear skies and can lead to prolonged periods of hot and dry weather.
    • Amplification by Global Warming: Studies suggest that global warming can intensify anticyclones, making them stronger and more persistent. Warmer temperatures due to climate change can enhance the evaporation of moisture from land and water surfaces, further reinforcing the stability of anticyclonic conditions.
    • Feedback Loop: Anticyclones can create a feedback loop with global warming. As anticyclones persist, they can exacerbate heatwaves by trapping heat near the surface, preventing it from escaping into the upper atmosphere. This trapped heat can then further strengthen the anticyclone, leading to a self-reinforcing cycle of heat and stability.

    What are the stages of early warnings?

    The stages of early warnings on the ‘ready-set-go’ system for disaster management

    • Ready: This stage involves providing a seasonal outlook based on background states and external factors like global warming and El Niño. The aim is to maximize the accuracy of longer-lead forecasts, enabling organizations like the National Disaster Management Agency (NDMA) and local governments to prepare their disaster response systems accordingly.
    • Set: In this stage, subseasonal predictions for weeks two to four are utilized. Resource allocations are made, and potential hotspots are identified to ensure that disaster preparedness is in place. This step involves moving resources, including personnel, to areas that are identified as at risk based on the extended range forecasts.
    • Go: The final stage, based on short- and medium-range forecasts (days 1-10), involves the activation of disaster response efforts. This includes implementing rescue operations, setting up hydration centers, heat shelters, and other necessary measures to manage the disaster effectively.

    Conclusion: All evidence suggests India’s prediction system and early warning systems continue to improve and the NDMA has worked these details well into its ‘ready-set-go’ system.The remaining challenges are to build resilience for the future by better predicting the trajectory of the weather at every location over India.

    Mains PYQ 

    Q Drought has been recognized as a disaster in view of its spatial expanse, temporal duration, slow onset and lasting effects on vulnerable sections. With a focus on the September 2010 guidelines from the National Disaster Management Authority (NDMA), discuss the mechanisms for preparedness to deal with likely El Nino and La Nina fallouts in India.

    https://www.thehindu.com/sci-tech/science/anticyclones-hanging-even-now-over-india-link-warming-to-heat/article68117359.ece

  • In news: Pripyat River

    Why in the news?

    • The WWF has issued a stark warning regarding the dredging of the Pripyat River, adjacent to the Chernobyl nuclear disaster site.
    • Concerns mount as the Pripyat River could transform into a permanent repository of radioactive substances, contaminating the water and food sources.

    About Pripyat River

    • Pripyat River is a significant waterway in Eastern Europe. It flows through Ukraine, Belarus, and a small portion of Russia.
    • It is primarily situated within the Polesian Lowland, a region characterized by marshes, wetlands, and forests.
    • The Pripyat River is approximately 761 km (473 miles) long.
    • Physical Features:
    • Tributaries: It has numerous tributaries, including the Stokhid River, Styr River, and Horyn River. The largest tributary of the Pripyat is the Teterev River, which joins it from the right bank.
    • Drainage Basin: Its basin covers an area of around 121,000 square kilometers (46,700 square miles). It is one of the major tributaries of the Dnieper River, which eventually flows into the Black Sea.

    Notable event: The Pripyat River gained international attention due to its proximity to the Chernobyl Nuclear Power Plant, where the catastrophic nuclear accident occurred in 1986.

    About Chernobyl Nuclear Disaster

    • The Chernobyl Disaster occurred on April 26, 1986.
    • It took place at the Chernobyl Nuclear Power Plant, near the town of Pripyat in northern Ukraine, then part of the Soviet Union.
    • The explosion and subsequent fire released a large amount of radioactive material such as cesium-137 and strontium-90 into the atmosphere, resulting in widespread contamination.

     

    PYQ:

    [2020] Consider the following pairs?

    River — Flows into

    1. Mekong — Andaman sea
    2. Thames — Irish Sea
    3. Volga — Caspian Sea
    4. Zambezi — Indian Ocean

    Which of the pairs above is/are correctly matched?

    (a) Only 1

    (b) Only 2

    (c) Only 3

    (d) None of the above/More than one of the above

  • Sympathetic Solar Flares

    Why in the news?

    A rare celestial event unfolded as four solar flares called as Sympathetic Solar Flares simultaneously, signaling the onset of the Sun’s dynamic 11-year solar cycle.

    What is a Solar Cycle?

    • Given the Sun’s dynamic nature, electrically charged gases on its surface generate powerful magnetic fields, known as magnetic fields.
    • These magnetic fields undergo stretching, twisting, and tangling due to the constant movement of gases on the Sun’s surface, resulting in solar activity.
    • Scientists monitor solar cycles using sunspots. Solar activity fluctuates throughout the solar cycle, which typically spans about 11 years. 
    • The onset of a solar cycle typically features minimal sunspot activity, termed as a solar minimum.
    • For instance, the last Solar Cycle 25 commenced in December 2019, characterized by a low number of sunspots.

    What are Sympathetic Solar Flares?

    • Sympathetic solar flares are solar eruptions that occur in close temporal and spatial proximity to another solar flare or eruption.
    • These events are believed to be interconnected through magnetic fields or other physical processes occurring on the Sun.
    • When a solar flare or eruption happens on the Sun, it releases a burst of electromagnetic radiation and charged particles into space.
    • In some cases, the energy released during these events can cause disturbances in the Sun’s magnetic field.
    • These disturbances can trigger the occurrence of additional flares loop or eruptions in nearby regions of the Sun’s surface.
    • This event follows coronal mass ejections (CMEs) and intense plasma bursts.

    Implications for Earth

    • Potential impacts include disruptions to power grids, interference with communication networks, and increased radiation exposure for astronauts and aircraft passengers.
    • Solar storms can lead to spectacular natural light shows known as auroras, which are typically visible near the Earth’s magnetic poles.

    PYQ:

    [2012] The increasing amount of carbon dioxide in the air is slowly raising the temperature of the atmosphere, because it absorbs:

    (a) the water vapour of the air and retains its heat

    (b) the ultraviolet part of the solar radiation

    (c) all the solar radiations

    (d) the infrared part of the solar radiation
  • PREMIUM – Travelling the Regions of South America

    PREMIUM – Travelling the Regions of South America

    Why in the News?

    South America, known for its diverse landscapes and cultures, also harbors several disputed territories, each with its own historical, geopolitical, and economic significance. These disputes often arise from conflicting territorial claims, historical grievances, or resource-rich areas. 

    Diverse Landscapes of South America:

    • The Pacific Coastal Strip:
      • Between the ocean and the Andes mountain Range.
      • The coastline of South America is smooth and regular. At the river mouths, some inlets are used as harbors. The southwestern coast of the continent has fiords or deep inlets of the sea.
    • Andes Mountain Range:
      • The Andes stretch through the entire continent, running in the north-south direction from the Isthmus of Panama to the Strait of Magellan. The second-highest mountain system in the world.
      • Mount Aconcagua (an extinct volcano lies in Argentina)
      • Mount Ojas del Salado is the highest active volcano in the world of Argentina.
      • Part of seven countries: Venezuela, Colombia, Ecuador, Bolivia, Peru, Chile, and Argentina.
      • They form a chain of ranges and knots with enclosed intermontane plateaus namely in Ecuador and Bolivia.
      • Being part of the Pacific Ring of Fire, there are many volcanoes and frequent earthquakes in this region. Mount Cotopaxi and Mount Chimborazo are active volcanic peaks, which is the highest peak in South America.
    • About the Amazon River:
      • It is the world’s largest and second-longest (6,400 km) river in the world after the Nile.
      • Its journey begins high in the Andes Mountains. The river then makes its way east through thousands of miles of rainforests and lowlands until it empties into the Atlantic Ocean on the northeastern coast of Brazil
      • Its watershed spans the countries of Brazil, Peru, Ecuador, Colombia, Venezuela, and Bolivia.
      • It has more than 1,100 tributaries, which include the rivers like the Rio Negro, the Madeira River, and the Xingu River, etc.
      • The Amazon Rainforest, which represents about half of the Earth’s remaining rainforest, also constitutes its single largest reserve of biological resources.
      • It is sometimes referred to as the “lungs of the Earth” due to its role in regulating the planet’s oxygen and carbon cycles.

    Disputed Areas in South America

    Countries Involved Key Points Geographical Features
    Gulf of Venezuela Colombia, Venezuela
    • Inlet of the Caribbean Sea is Disputed over islands such as Los Monjes Archipelago due to Fishing rights and potential oil reserves.
    • Interpretation disputes regarding the 1941 Treaty of Delimitation            
    • Recent tensions over maritime confrontations and oil exploration activities.
    		 Surrounded by coastal mountain ranges with waters fed by several rivers
    Essequibo Region Guyana, Venezuela
    • Covers two-thirds of Guyana’s territory Historical grievances claimed by Venezuela.         
    • Recent oil discoveries raising tensions; ICJ case filed by Guyana.
    • Essequibo River flows through this region.
    		 Diverse landscapes including rainforests, savannahs, and mountains with the Essequibo River
    Atacama Desert Peru, Chile
    • Extremely Arid desert region            
    • War of the Pacific led to Chile’s control           
    • Valuable mineral resources contribute to disputes            
    • Bilateral talks and arbitration proposals for settlement
    		 Bordered by the Andes Mountains and the Pacific Ocean with salt flats, sand dunes, and volcanic formations
    Falkland Islands (Malvinas) Argentina, UK
    • Sovereignty disputes since 1833           
    • Economic interests include fisheries, tourism, and potential oil reserves           
    • Diplomatic efforts and UN resolutions for resolution
    		 Consists of two main islands with rugged coastlines and low mountains
    Darien Gap Colombia, Panama
    • Dense jungle terrain separating North and South America            
    • Challenges in illegal immigration discussions            
    • Characterized by dense rainforests, swamps, and mountains
    		 Part of the Darien National Park with dense rainforests, mangroves, and steep mountain slopes
    Arroyo de la Invernada or Rincon de Artigas… Brazil, Uruguay
    • Dispute over the Invernada River region near Masoller            
    • UN does not officially recognize the claim            
    • 237 km2 region with significant natural resources            
    • Efforts to resolve through bilateral talks and international mediation
    		 Rolling hills, grasslands, and small rivers with the Invernada River
    New River Triangle (Tigri Area) Suriname, Guyana
    • Disputed region within the Guiana Highlands            
    • Conflicting claims over territory interpretation of historical treaties and boundaries
    		 Dense rainforests, mountain ranges, and numerous rivers
    Isla Brasilera/Ilha Brasileira Brazil, Uruguay
    • Uruguay claims ownership of Isla Brasilera            
    • Strategically located near the tripoint with Argentina            
    • Efforts to resolve through diplomatic negotiations and legal arguments
    		 Small island located in the Uruguay River with lush vegetation
    Isla Suarez/Ilha de Guajara-mirim Bolivia, Brazil
    • Located in the Rio Mamore as a border between Bolivia and Brazil           
    • Economically dependent on Guajara-Mirim, Brazil            
    • Treaty signed in 1958 maintains the status quo            
    • Challenges of border management in riverine environments
    		 Riverine island characterized by tropical vegetation and wetlands
    Southern Patagonian Ice Field Argentina, Chile
    • Spanning parts of Argentina and Chile            
    • Border demarcation remains undefined in certain areas           
    • Bilateral efforts for resolution include scientific cooperation and mapping projects
    		 Vast expanse of ice and snow covering rugged mountain ranges and deep valleys
    Lithium Triangle  Argentina, Bolivia, and Chile
    • It is characterized by various salt pans or salars, concentrated along the Atacama Desert and adjacent arid regions.
    • The Salar de Atacama in Chile boasts the highest lithium concentration (0.15% by weight) among all brine sources worldwide. 
    • Argentina boasts more than half of the world’s total lithium resources and holds the distinction of having the 2nd-largest lithium resources, the 3rd-largest lithium reserves, and the 4th-largest lithium production in the world.
    • India’s KABIL (Khanij Bidesh India Ltd) has announced an investment of ₹211 crore ($25.712 million) over five years for exploration stage activities in five lithium blocks in the Fiambala area of Argentina.
    		 Key reserves of Lithium include:

    1. Uyuni (Bolivia): This salt flat is not only the world’s largest salt flat but also contains significant lithium reserves.  
    2. Atacama (Chile): Located in the Atacama Desert, Salar de Atacama is home to one of the largest lithium reserves globally. 
    3. Hombre Muerto (Argentina): This salt flat in northwestern Argentina also hosts lithium extraction operations.

     

    Note: Bolivia and Paraguay are land-locked countries in South America

    PYQ:

    [2013] “Climate is extreme, rainfall is scanty and the people used to be nomadic herders.”  

    The above statement best describes which of the following regions?

    (a) African Savannah

    (b) Central Asian Steppe

    (c) South American Tropical

    (d) Siberian Tundra