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GS Paper: GS1-15.Geographical features and their location- Changes in critical geographical features (including water-bodies and ice-caps) and in flora and fauna and the effects of such changes.

  • Minamitori Island  

    Why in the News?

    Japan has decided to conduct test mining of rare earth rich mud from the deep seabed near Minamitori Island to reduce dependence on imported critical minerals.

    About Minamitori Island

    • Minamitori Island is also known as Marcus Island.
    • It is an isolated Japanese coral atoll located in the northwestern Pacific Ocean.
    • It marks the easternmost territorial point of Japan.
    • It is the first location in Japan to witness sunrise due to its eastern position.
    • The island is situated about 1,950 kilometres southeast of central Tokyo.

    Geographical and Geological Features

    • Minamitori Island represents the exposed summit of a massive underwater seamount.
    • The seamount rises from the deep ocean floor along the Marcus Necker Ridge.
    • It is the only landmass of Japan that lies entirely on the Pacific Plate.
    • The island provides Japan with a large Exclusive Economic Zone in the Pacific Ocean.

    What is Rare Earth Mud

    • Rare earth mud is a type of pelagic sediment formed from the accumulated remains of plankton.
    • Over millions of years, these sediments become enriched with rare earth elements.
    • The mud contains significant quantities of neodymium and dysprosium.
    • These elements are essential for manufacturing high performance permanent magnets.
    Consider the following statements: (2021)

    1. The Global Ocean Commission grants licenses for seabed exploration and mining in international waters. 

    2. India has received licenses for seabed mineral exploration in international waters. 

    3. ‘Rare earth minerals’ are present on the seafloor in international waters. 

    Which of the statements given above are correct? 

    (a) 1 and 2 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2, and 3

  • Chillai Kalan Begins in Kashmir 

    Why in the News?

    The higher reaches of Kashmir Valley witnessed snowfall and the plains received rain as Chillai-Kalan, the harshest 40 day winter phase, began on December 21, 2025.

    What is Chillai Kalan

    • Meaning: Big cold in Kashmiri
    • Duration: 40 days
    • Period: December 21 to January 30
    • Significance: Coldest phase of winter in Kashmir
    • Belief: Rain or snow on the first day is considered a good omen and indicates heavy snowfall ahead

    Importance of the Precipitation

    • Ended a prolonged dry spell in the Valley
    • Helped reduce dust and dryness
    • Expected to improve water availability and snow reserves
    • Dry winter last year had caused
      • Health issues like cough and cold
      • Problems for agriculture and tourism sector

    Follow-Up Cold Phases

    After Chillai Kalan, Kashmir experiences two shorter cold spells

    • Chillai Khurd meaning small cold
    • Chillai Bacha meaning baby cold

    Prelims Pointers

    • Chillai Kalan is unique to Kashmir climate tradition
    • Heavy snowfall during this phase replenishes glaciers and water sources
    • Gulmarg and Sonamarg are key winter tourism centres
    • Sadhna Top is strategically important due to its proximity to the Line of Control
    [2015] Consider the following statements: 

    1. The winds which blow between 30° N and 60° S latitudes throughout the year are known as westerlies. 

    2. The moist air masses that cause winter rains in North-Western region of India are part of westerlies. 

    Which of the statements given above is/are correct? 

    (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2

  • Kavachi Volcano

    Why in the News?

    Scientists have reported rare underwater footage showing sharks living inside the crater of Kavachi volcano, near the Solomon Islands. This discovery challenges earlier assumptions about marine survival in extreme volcanic environments.

    About Kavachi Volcano

    • A shallow submarine volcano located in the South Pacific Ocean
    • Situated south of Vangunu Island in the Solomon Islands
    • Lies on the Pacific Ring of Fire, a highly tectonically active zone
    • Among the few active and visible undersea volcanoes in the world

    Volcanic Activity

    • Known for frequent but unpredictable eruptions
    • First documented eruptive activity in 1939
    • Has experienced multiple temporary island forming events

    Prelims Pointers

    • Type: Submarine volcano
    • Location: South Pacific Ocean
    • Tectonic setting: Pacific Ring of Fire
    • Key feature: Temporary island formation
    • Recent relevance: Sharks observed inside a volcanic crater

    [2024] Consider the following: 1. Pyroclastic debris 2. Ash and dust 3. Nitrogen compounds 4. Sulphur compounds. How many of the above are products of volcanic eruptions? 

    (a) Only one

    (b) Only two

    (c) Only three

    (d) All four 

  • Hormuz Island

    Why in the News?

    • A rare natural phenomenon turned the coastlines of Hormuz Island into a blood red landscape, drawing global attention

    About Hormuz Island

    • Location: Iran, on the Strait of Hormuz
    • Lies between the Persian Gulf and the Gulf of Oman
    • Situated about 8 km off the Iranian coast
    • Area: 41.9 sq km
    • A hilly island with distinctive geomorphology

    Geological Features

    • Composed mainly of sedimentary rocks and volcanic ash
    • Dominant red colour due to high iron oxide content
    • Presence of hematite mineral gives the soil its deep red hue
    • Ocean waves turn pink when they wash over iron rich sands

    Soil and Climate

    • Experiences low precipitation
    • Soil and water are saline in nature
    • Landscape is largely barren

    Unique Identity

    • Known as Rainbow Island due to multi coloured soil
    • Sand and soil colours include red, gold, silver, and white

    Human Settlement and Livelihood

    • Hormuz village is the only permanent settlement
    • Fishing is the primary source of livelihood
    • Inhabited mainly by the Bandari ethnic group

    What is the importance of developing Chabahar Port by India? (2017)

    (a) India’s trade with African countries will enormously increase. 

    (b) India’s relations with oil-producing Arab countries will be strengthened. 

    (c) India will not depend on Pakistan for access to Afghanistan and Central Asia. 

    (d) Pakistan will facilitate and protect the installation of a gas pipeline between Iraq and India.

  • Bitra Island

    Why in the News?

    The Chief of Staff, Southern Naval Command, announced that the Indian Navy is setting up a detachment on Bitra Island, and the facility is almost completed. This will make Bitra the third island in Lakshadweep to host a defence establishment.

    About Bitra Island

    • Location: Northern Lakshadweep, Arabian Sea
    • Smallest inhabited island in Lakshadweep
    • Land area: 0.105 sq. km
    • Dimensions: Length – 0.57 km | Width – 0.28 km
    • Lagoon area: 45.61 sq. km (significantly larger than the landmass)
    • Population (2011): 271

    Key Features

    • Cultural Significance: Hosts a shrine of Malik Mulla, an Arab saint believed to be buried there.
      • Important pilgrimage site for locals across Lakshadweep.
    • Ecology: Once covered with thick shrubs.
      • Historically a major breeding ground for seabirds, which declined in the 19th century due to human interference.
    • Climate: Similar to Kerala’s climate.
    • Hottest months: March–May
    • Temperature: 25°C – 35°C
    • Humidity: 70–76% throughout most of the year.

    Strategic Importance

    • Located in a key position in the Arabian Sea, critical for maritime security.
    • Enhances surveillance over sea lanes close to India’s western maritime frontier.
    • Adds to Lakshadweep’s defence infrastructure:
      • INS Dweeprakshak – Kavaratti
      • INS Jatayu – Minicoy
      • New Navy detachment – Bitra Island

    Prelims Pointers

    • Bitra = smallest inhabited island of Lakshadweep
    • Features a shrine of Malik Mulla
    • Large lagoon-to-land ratio
    • Strategically vital for India’s naval presence in the Arabian Sea
    • Climate closely resembles Kerala
    Which one of the following pairs of islands is separated from each other by the ‘Ten Degree Channel’? (2014)

    (a) Andaman and Nicobar 

    (b) Nicobar and Sumatra 

    (c) Maldives and Lakshadweep 

    (d) Sumatra and Java

  • Volcanic Eruption in Ethiopia and Impact on India

    Why in the news?

    The Hayli Gubbi volcano in Ethiopia’s Afar region erupted on 23 November 2025 after nearly 12,000 years of dormancy, producing a massive ash plume rising to ~14 km (45,000 ft). High-level winds transported volcanic ash across the Red Sea and Arabian Peninsula towards western and northern India, causing temporary disruption in aviation operations.

    Key Facts: Location & Geological Background 

    Hayli Gubbi Volcano

    • Type: Shield volcano
    • Location: Afar Region, Ethiopia (part of the East African Rift System)
    • Dormancy: Last known activity ~10,000–12,000 years ago (Holocene threshold)
    • Geological Setting: Lies on the triple junction where the Arabian, Nubian, and Somali plates are diverging → high tectonic activity.

    East African Rift System (EARS)

    • A major continental rift zone.
    • Known for active volcanism (Erta Ale, Dabbahu, Nabro, etc.).
    • Possible future site of a new ocean basin due to plate divergence.

    Impact on India

    1. Flight Disruptions

    • Several international flights cancelled or delayed (Delhi, Mumbai, Hyderabad, Kochi).
    • Airlines: Air India, IndiGo, Akasa Air initiated precautionary measures.
    • Aircraft inspections ordered for those that flew through potentially affected air corridors.

    2. Airspace Management

    • Civil Aviation Ministry, Air Traffic Control (ATC), and the India Meteorological Department (IMD) issued continuous advisories.\
    • No major safety threat, but routing adjustments and cancellations made as precaution.

    3. No Impact on Local Weather or Air Quality

    • IMD clarified:
      • Ash remained in upper troposphere.
      • No impact on ground-level AQI.
      • Delhi’s poor air quality is unrelated, caused by local pollution.

    4. Clearance Timeline

    • Ash plume expected to move completely towards China by 7:30 pm, Nov 25.

    Why Aviation Avoids Volcanic Ash? 

    • Ash melts inside jet engines → forms glassy deposits → engine flameout.
    • Damages navigation systems & windshields.
    • Reduces visibility.
    • Can cause stalls, loss of thrust, and total engine failure.

    Relevant Organisation:
    ▶ Volcanic Ash Advisory Centers (VAACs) issue global alerts—here, Toulouse VAAC monitored the plume.

    Consider the following: (2024)

    1. Pyroclastic debris 

    2. Ash and dust 

    3. Nitrogen compounds 

    4. Sulphur compounds 

    How many of the above are products of volcanic eruptions? 

    (a) Only one 

    (b) Only two 

    (c) Only three 

    (d) Only four

  • Meghalaya’s Umngot River turns Muddy

    Why in the News?

    The Umngot River, celebrated for its crystal-clear waters and tourist appeal at Dawki and Shnongpdeng, has turned murky and opaque.

    Meghalaya’s Umngot River turns Muddy

    About Umngot River:

    • Location: Flows through West Jaintia Hills district, Meghalaya, close to the India–Bangladesh border.
    • Origin: Arises from the Jaintia Hills, traversing limestone-rich terrain that naturally filters impurities and maintains clarity.
    • Distinct Appearance: Known for its crystal-clear waters that create the illusion of boats floating on air, earning it global recognition.
    • Length & Course: Flows southward to Dawki town, where it merges with Bangladesh’s Piyain River.
    • Ecological Features: Possesses high dissolved oxygen levels, preventing algal growth and supporting diverse aquatic biodiversity.
    • Tourism Hub: Popular at Dawki and Shnongpdeng for boating, fishing, camping, and eco-tourism, drawing thousands of visitors annually.
    • Infrastructure Landmark: The Dawki Suspension Bridge (1932) is a heritage structure spanning the river and serving as a trade route link.
    • Economic Role: Sustains cross-border trade, local fishing, and tourism-driven livelihoods vital to Meghalaya’s rural economy.
    • Cultural Boundary: Serves as a natural divider between Ri Pnar (Jaintia Hills) and Hima Khyrim (Khasi Hills).

    Cause of Discoloration:

    • Primary Cause: Linked to Shillong–Dawki road-widening project upgrading it to a two-lane highway with a 400 m bridge at Dawki.
    • Pollution Source: Hill-cutting, excavation, and soil dumping along sites near Umtyngar and Dawki caused heavy sediment runoff.
    • Inspection Findings: The Meghalaya State Pollution Control Board (MSPCB) detected uncontained debris and sliding soil entering the river, reducing water transparency.
    [UPSC 2021] Consider the following rivers:

    1. Brahmani 2. Nagavali 3. Subarnarekha 4. Vamsadhara

    Which of the above rise from the Eastern Ghats?

    Options: (a) 1 and 2 (b) 2 and 4* (c) 3 and 4 (d) 1 and 3

     

  • Floods force closure of Bhavani Island

    Why in the News?

    Flood discharges at Prakasam Barrage on the Krishna River has led to the closure of Bhavani Island from the mainland.

    About Bhavani Island:

    • Location: Situated on the Krishna River, near Vijayawada, Andhra Pradesh.
    • Area: Spans ~133 acres, among India’s largest river islands.
    • Management: Operated by the Andhra Pradesh Tourism Department as a major eco-tourism and recreational hub.
    • Accessibility: Lies upstream of Prakasam Barrage, connected only by ferry services from the mainland.
    • Ecology & Features: Rich in greenery, ponds, and meadows, offering boating, gardens, adventure parks, rural museums, and event spaces.
    • Cultural Link: Named after Goddess Bhavani (Kanaka Durga); her temple atop Indrakeeladri Hill overlooks the river.

    Krishna River

    Floods force closure of Bhavani Island

    • Overview: One of India’s major peninsular rivers, stretching about 1,400 km.
    • Origin & Course: Rises near Mahabaleshwar (Maharashtra), flows eastward through Karnataka, Telangana, and Andhra Pradesh, entering the Bay of Bengal at Hamsaladeevi.
    • Basin Extent: Covers ~2.59 lakh sq km, nearly 8% of India’s area.
    • Boundaries: Flanked by Balaghat Range (north), Eastern Ghats (east), and Western Ghats (west).
    • Tributaries:
      • Right Bank: Ghataprabha, Malaprabha, Tungabhadra, and Musi Rivers.
      • Left Bank: Bhima, Koyna, Yerla, Panchganga, and Dudhganga Rivers.
    • Projects & Dams: Major hydropower and irrigation structures including Almatti, Srisailam, Nagarjuna Sagar, Narayanpur, and Jurala.
    • Prakasam Barrage: Built near Vijayawada to regulate water flow, support irrigation, navigation, and tourism.
    • Economic Role: Sustains agriculture, fisheries, and power generation, forming the riverine backbone of southern India.
  • [29th October 2025] The Hindu OpED: Relief, Rehabilitation: India’s east coast and cyclones

    PYQ Relevance

    [UPSC 2014] Tropical cyclones are largely confined to the South China Sea, Bay of Bengal and Gulf of Mexico. Why?

    Linkage: Cyclones are a recurring topic in GS Paper 1 (Geography) and GS Paper 3 (Disaster Management) due to their climatic, socio-economic, and governance relevance. The PYQ links directly to this theme as it explains the geophysical reasons behind the east coast’s high cyclone frequency and sets the context for India’s preparedness and rehabilitation strategies.

    Mentor’s Comment

    The recurring cyclones on India’s eastern coast highlight not only the country’s growing vulnerability to extreme weather events but also the evolution of its disaster management framework. The recent Cyclone Montha once again tested India’s readiness, reflecting both commendable progress and continuing challenges in disaster response, livelihood security, and post-disaster rehabilitation.

    Why in the News

    Cyclone Montha, which began intensifying into a severe cyclonic storm over the Bay of Bengal on October 27-28, 2025, has revived memories of devastating cyclones such as the 1977 Andhra cyclone and the 1999 Odisha super cyclone, each claiming nearly 10,000 lives. Although Montha was not as intense, it tested disaster preparedness mechanisms across Andhra Pradesh and Odisha. The event underlines both improved resilience and the persisting socio-economic costs of cyclones in India’s coastal belt, a region that historically faces the brunt of Bay of Bengal storms during October-November.

    Introduction

    India’s eastern coastline, especially Odisha and Andhra Pradesh, has long been vulnerable to tropical cyclones. Historically, the Bay of Bengal has produced some of the world’s deadliest cyclonic events. While the India Meteorological Department (IMD) and National Disaster Response Force (NDRF) have strengthened forecasting and evacuation systems, the scale of livelihood disruption, property damage, and rural distress continues to make post-cyclone rehabilitation a critical governance concern.

    Why is India’s East Coast So Vulnerable to Cyclones?

    1. Geographical Exposure: The Bay of Bengal’s funnel shape and warm waters create conditions for cyclogenesis, making the east coast more cyclone-prone than the west.
    2. Seasonal Concentration: Historically, October-November are peak months, with nine of twelve major cyclones (18th-20th century) recorded during this period.
    3. High Human Impact: The 1977 Andhra and 1999 Odisha cyclones each caused ~10,000 deaths, highlighting the historic vulnerability.

    How Prepared Are India’s Coastal States Today?

    1. Institutional Mechanisms: Strengthened Union and State disaster management authorities and IMD’s early warning systems have made large-scale loss of life “a thing of the past.”
    2. Evacuation Efficiency: Nearly 10,000 people evacuated from Andhra’s Kakinada and Konaseema during Cyclone Montha.
    3. Red Alert Response: Prompt deployment of NDRF teams and coordinated district-level action in red-alert zones of southern Odisha.

    What Are the Persisting Gaps and Challenges?

    1. Property and Livelihood Loss: Even with reduced fatalities, damage to homes, livestock, and agriculture remains high, affecting underprivileged sections.
    2. Economic Vulnerability: Cyclones disrupt milch animals, draught animals, and poultry, impacting rural incomes and food security.
    3. Infrastructure Fragility: Despite improvements, coastal roads, electricity grids, and communication lines remain highly exposed to storm surges and floods.

    What Has Been Learnt from Past Disasters?

    1. Adaptive Governance: Following disasters like Cyclone Gaja (2018), governments have adopted structural and non-structural mitigation measures, including cyclone shelters, embankments, and mangrove restoration.
    2. Skill Enhancement: Continuous upgrading of disaster management knowledge and coordination among states such as Andhra Pradesh, Odisha, and Tamil Nadu.
    3. Community Engagement: Enhanced public awareness and local volunteer networks contribute to faster evacuations.

    What Should Be the Way Forward for Relief and Rehabilitation?

    1. Holistic Recovery Approach: Combine immediate relief with long-term livelihood restoration and climate-resilient infrastructure.
    2. Inclusive Policy Execution: Focus on the most vulnerable coastal communities, particularly fishers and small farmers.
    3. Leadership Accountability: Political and administrative leadership must ensure effective implementation of rehabilitation and reconstruction measures post-disaster.

    Conclusion

    India’s eastern coastline remains a climatic frontier where human resilience is tested year after year. The evolution from reactive relief to proactive risk reduction marks a significant policy success. Yet, the persistence of livelihood loss and infrastructure fragility calls for stronger implementation, community engagement, and leadership accountability. Relief and rehabilitation must now evolve into a model of climate-adaptive, inclusive coastal development.