What is the name of the strait where ‘Adams bridge’ is situated?

1. India's Maritime Zones and UNCLOS (basic)

When we look at the map of India, we often focus on the land boundaries from Kashmir to Kanyakumari. However, a significant portion of India's jurisdiction lies beneath the waves. To manage the world's oceans, the United Nations Convention on the Law of the Sea (UNCLOS) established a standardized system of maritime zones. Think of these zones as layers of authority that decrease as you move further away from the shore. All sea-wealth, including minerals and oil within these zones, vests in the Union of India rather than individual coastal states Indian Polity, M. Laxmikanth (7th ed.), Rights and Liabilities of the Government, p.551.

Everything starts at the Baseline, which is typically the low-water mark along the coast. From this line, we measure the following key zones:

• Territorial Waters: Extending up to 12 nautical miles (approximately 21.9 km), this zone is an extension of India's sovereign territory. India exercises full control here, just as it does on land INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), India — Location, p.2.
• Contiguous Zone: Extending up to 24 nautical miles, India can exercise limited control to prevent or punish infringements of its customs, fiscal, immigration, or sanitary laws.
• Exclusive Economic Zone (EEZ): Extending up to 200 nautical miles, India has the exclusive right to explore and exploit natural resources (like fishing and seabed mining). While foreign ships have the "right of innocent passage," they cannot harvest resources here Indian Polity, M. Laxmikanth (7th ed.), Rights and Liabilities of the Government, p.551.

Feature	Territorial Waters	Exclusive Economic Zone (EEZ)
Distance	12 Nautical Miles	200 Nautical Miles
Nature of Power	Full Sovereignty (like land)	Sovereign rights over resources only

India’s maritime reach is significantly expanded by its island territories. The Andaman and Nicobar Islands in the Bay of Bengal and Lakshadweep in the Arabian Sea allow India to claim vast EEZs far from the mainland, making India a dominant maritime power in the Indian Ocean region Geography of India, Majid Husain (9th ed.), Regional Development and Planning, p.90.

Sources: Indian Polity, M. Laxmikanth (7th ed.), Rights and Liabilities of the Government, p.551; INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), India — Location, p.2; Geography of India, Majid Husain (9th ed.), Regional Development and Planning, p.90

2. Major Gulfs and Bays of the Indian Coast (basic)

When we look at the jagged coastline of India, we see several places where the sea pushes deep into the land. These indentations are called gulfs or bays. In simple terms, a Gulf is a large body of water almost surrounded by land, except for a narrow opening. These are vital for India’s economy as they serve as natural harbors, sites for energy generation, and treasure troves of marine biodiversity.

On India's western coast, the state of Gujarat features two prominent gulfs. The Gulf of Kutch is located in the north and separates the Rann of Kutch from the Kathiawar Peninsula Geography of India, Majid Husain, Physiography, p.64. Further south lies the Gulf of Khambhat (formerly Cambay), where major rivers like the Narmada and Tapti discharge. Both these gulfs are famous for their extremely high tidal ranges, making them ideal locations for tidal energy projects Indian Economy, Nitin Singhania, Infrastructure, p.452.

Feature	Gulf of Kutch	Gulf of Khambhat
Location	North-western Gujarat (near Rann of Kutch)	Southern Gujarat (near mouth of Narmada)
Significance	Separates Kathiawar from Rann; Tidal energy potential	Major river estuary point; High tidal energy potential

Moving to the southern tip, we encounter the Gulf of Mannar and the Palk Bay. These are separated by a unique geological feature called Adam’s Bridge (or Ram Setu), a chain of limestone shoals connecting India’s Rameswaram to Sri Lanka’s Mannar Island Geography of India, Majid Husain, India-Political Aspects, p.50. While the Gulf of Mannar is a world-renowned Marine Biosphere Reserve, it also holds potential for offshore petroleum and natural gas deposits Geography of India, Majid Husain, Energy Resources, p.13.

Sources: Geography of India ,Majid Husain, (McGrawHill 9th ed.), Energy Resources, p.13; Geography of India ,Majid Husain, (McGrawHill 9th ed.), Physiography, p.64; Indian Economy, Nitin Singhania .(ed 2nd 2021-22), Infrastructure, p.452; Geography of India ,Majid Husain, (McGrawHill 9th ed.), India-Political Aspects, p.50

3. Strategic Global Straits (Bering, Cook, and Taiwan) (intermediate)

To understand the maritime world, we must look at straits—narrow passages of water that connect two larger water bodies and serve as critical 'choke points' for global trade and security. While we often focus on the Indian subcontinent, identifying these global straits helps us distinguish them from our local features like the Palk Strait. Let’s look at three heavyweights of global geography: the Bering, Cook, and Taiwan Straits. The Bering Strait is perhaps the most famous, serving as the icy gateway between the Arctic Ocean (Chukchi Sea) and the Pacific Ocean (Bering Sea). It separates the two largest continents, Asia (Russia) and North America (USA/Alaska). Crucially, it is the point where the International Date Line passes between the Diomede Islands Physical Geography by PMF IAS, Latitudes and Longitudes, p.247. Economically, this region is a powerhouse for the fishing industry; the convergence of cold waters makes it a primary ground for salmon and other species Environment and Ecology, Majid Hussain, Locational Factors of Economic Activities, p.30. Moving to the Southern Hemisphere, the Cook Strait separates the North and South Islands of New Zealand. It connects the Tasman Sea to the west with the South Pacific Ocean to the east. Navigating this strait is famously difficult due to the powerful Westerlies (the 'Roaring Forties') and the confluence of currents from the Tasman Sea Certificate Physical and Human Geography, GC Leong, The Oceans, p.111. Finally, the Taiwan Strait (or Formosa Strait) is a vital 180-km wide passage connecting the East China Sea and the South China Sea. It is one of the busiest shipping lanes in the world, facilitating trade between Europe, North America, and the major ports of East Asia like Hong Kong and Tokyo FUNDAMENTALS OF HUMAN GEOGRAPHY, CLASS XII, Transport and Communication, p.63.

Strait	Water Bodies Connected	Landmasses Separated
Bering	Arctic Ocean & Pacific Ocean	Russia (Asia) & Alaska (N. America)
Cook	Tasman Sea & South Pacific	New Zealand (North & South Islands)
Taiwan	East China Sea & South China Sea	Mainland China & Taiwan Island

Sources: Physical Geography by PMF IAS, Latitudes and Longitudes, p.247; Environment and Ecology, Majid Hussain, Locational Factors of Economic Activities, p.30; Certificate Physical and Human Geography, GC Leong, The Oceans, p.111; FUNDAMENTALS OF HUMAN GEOGRAPHY, CLASS XII (NCERT 2025 ed.), Transport and Communication, p.63

4. The Sethusamudram Shipping Canal Project (intermediate)

The Sethusamudram Shipping Canal Project (SSCP) is a massive infrastructure proposal designed to create a navigable sea route through the Palk Strait and Gulf of Mannar. Currently, the waters between India and Sri Lanka are too shallow (often only 3 to 11 meters deep) for large merchant vessels to pass. Consequently, ships traveling between India’s west coast (like Mumbai) and east coast (like Kolkata) must circumnavigate the entire island of Sri Lanka, adding approximately 350 to 424 nautical miles to their journey Geography of India, Chapter 12, p. 25.

At the heart of this project lies Adam's Bridge (also known as Ram Setu), a 30 to 48-kilometer-long chain of limestone shoals and sandbars. This structure acts as a natural geological divide, separating the Palk Bay in the north from the Gulf of Mannar in the south Geography of India, Chapter 16, p. 50. To make this route viable for ships, the project requires extensive dredging—the process of excavating the seabed to create a channel deep enough for deep-draft vessels Environment, Chapter 5, p. 47.

Feature	Economic Potential	Ecological/Social Concerns
Impact	Significant reduction in fuel costs and sailing time (up to 30 hours).	Potential damage to the Gulf of Mannar Biosphere Reserve, home to coral reefs and Dugongs.
Strategic Value	Boosts the productivity of Indian ports like Tuticorin.	Risk of disturbing the geological and religious heritage of Ram Setu.

Because the project involves major dredging in a sensitive marine zone, it falls under the mandatory Environmental Impact Assessment (EIA) framework. In India, EIA was formalized to ensure that large-scale projects like ports, harbours, and shipping canals are evaluated for their long-term impact on biodiversity before they are cleared Environment and Ecology, Environmental Degradation and Management, p. 49. Just as scholars have raised concerns about the ecological sustainability of the Indira Gandhi Canal in Rajasthan, the SSCP faces scrutiny over whether its economic benefits outweigh the potential permanent loss of marine habitats NCERT Class XII: India People and Economy, Chapter 9, p. 73.

Sources: Geography of India, Majid Husain, Chapter 12: Transport, Communications and Trade, p.25; Geography of India, Majid Husain, Chapter 16: India–Political Aspects, p.50; Environment, Shankar IAS Academy, Chapter 5: Aquatic Ecosystem, p.47; Environment and Ecology, Majid Husain, Environmental Degradation and Management, p.49; NCERT Class XII: India People and Economy, Chapter 9: Planning and Sustainable Development, p.73

5. India-Sri Lanka Maritime Boundary & Katchatheevu (exam-level)

To understand the maritime relationship between India and Sri Lanka, we must first look at the unique physical geography of the Palk Strait. This shallow sea, roughly 30 km wide, separates the two nations. The nearest points of contact are Dhanushkodi in Tamil Nadu (India) and Talaimannar on Mannar Island (Sri Lanka) Geography of India, Majid Husain, Ch 16, p. 50. Connecting these two points is a 30 to 48-kilometer-long chain of limestone shoals and sandbars known as Adam's Bridge (Ram Setu). Geologically, this structure acts as a natural divide, separating the Palk Bay to the north from the Gulf of Mannar to the south Geography of India, Majid Husain, Ch 12, p. 25.

The most sensitive point in this maritime boundary is Katchatheevu, a tiny uninhabited islet of about 1.92 sq km. Historically, the boundary was fluid, but in 1974, the Indian government under Indira Gandhi ceded Katchatheevu to Sri Lanka through the Indo-Sri Lankan Maritime Agreement. This was a strategic move intended to stabilize the neighboring socialist government of Sirimavo Bandaranaike A Brief History of Modern India, Spectrum, After Nehru, p. 700. While the 1974 agreement allowed Indian fishermen to dry their nets and engage in traditional activities on the island, a subsequent agreement in 1976 established Exclusive Economic Zones (EEZs), which effectively barred fishermen from both countries from entering each other's waters without express permission A Brief History of Modern India, Spectrum, After Nehru, p. 701.

Feature	1974 Agreement	1976 Agreement
Primary Outcome	Ceded Katchatheevu to Sri Lanka.	Defined the maritime boundary in the Gulf of Mannar and Bay of Bengal.
Fishing Rights	Allowed Indian fishermen to dry nets and rest on Katchatheevu.	Strictly prohibited fishing in the other country’s EEZ.

This maritime region is not just a political boundary but a vital economic zone. The Gulf of Mannar is renowned for its marine biodiversity, and marine fisheries contribute significantly to the economy of the southern coast. However, the lack of a clear "physical" fence in the sea leads to frequent arrests of Indian fishermen by the Sri Lankan Navy when they cross the International Maritime Boundary Line (IMBL) in search of better catch, which is more abundant on the Sri Lankan side due to lower fishing pressure Geography of India, Majid Husain, Ch 5, p. 86.

Sources: Geography of India, Majid Husain, Chapter 16: India–Political Aspects, p.50; Geography of India, Majid Husain, Chapter 12: Transport, Communications and Trade, p.25; A Brief History of Modern India, Spectrum, After Nehru, p.700-701; Geography of India, Majid Husain, Chapter 5: Agriculture, p.86

6. Adam's Bridge (Ram Setu) and the Palk Strait (exam-level)

When we look at the narrow stretch of water separating the Indian peninsula from the island nation of Sri Lanka, we encounter a fascinating geographical feature known as the Palk Strait. This shallow sea is approximately 30 km wide and serves as the maritime boundary between the two countries Geography of India, Majid Husain, Chapter 16: India–Political Aspects, p.50. Within this strait lies Adam's Bridge (also known as Ram Setu), a 30 to 48-kilometer-long chain of limestone shoals and sandbars that physically connects Rameswaram Island in Tamil Nadu to Mannar Island in Sri Lanka.

Geologically, Adam's Bridge is a unique structure. Scientific studies suggest it is a natural formation resulting from the deposition of sediments and tectonic movements over millennia. It is primarily composed of limestone, sandbars, and coral formations that evolved in the shallow continental shelf Geography of India, Majid Husain, Chapter 12: Transport, Communications and Trade, p.27. This bridge acts as a critical geological divide: it separates the Palk Bay to the north from the Gulf of Mannar (a biological hotspot and Biosphere Reserve) to the south.

To pinpoint its location precisely, the bridge starts from Dhanushkodi on the tip of India's Pamban Island and terminates at Talai Mannar on Sri Lanka's Mannar Island Geography of India, Majid Husain, Chapter 16: India–Political Aspects, p.50. Beyond its physical geography, the region has high strategic and political value. For instance, the tiny islet of Katchatheevu, located in the Palk Strait, was ceded by India to Sri Lanka in 1974 to settle maritime boundaries, though it remains a point of discussion regarding the fishing rights of Indian fishermen Spectrum, A Brief History of Modern India, After Nehru, p.700.

Feature	Details
Terminals	Dhanushkodi (India) to Talai Mannar (Sri Lanka)
Composition	Limestone shoals, sandbars, and coral formations
Water Divide	Separates Palk Bay (North) from Gulf of Mannar (South)

Sources: Geography of India, Majid Husain, Chapter 16: India–Political Aspects, p.50; Geography of India, Majid Husain, Chapter 12: Transport, Communications and Trade, p.27; Spectrum, A Brief History of Modern India, After Nehru, p.700

7. Solving the Original PYQ (exam-level)

You have just mastered the foundational concepts of India’s physical geography and its maritime boundaries; now it is time to apply that spatial awareness. This question tests your ability to link a specific geological feature, Adams bridge (also known as Ram Setu), to its precise hydrographic location. As you learned, this 30 to 48-kilometer-long chain of limestone shoals connects India (specifically Rameswaram Island) to Sri Lanka (Mannar Island). In Geography of India, Majid Husain, this area is highlighted as a critical geological divide between the Palk Bay and the Gulf of Mannar.

To arrive at the correct answer, visualize the southern tip of the Indian peninsula. The narrow sea separating the Tamil Nadu coast from the northern coast of Sri Lanka is the Palk Strait. Since Adams bridge serves as the physical link between these two nations within that specific body of water, it must be situated in the Palk Strait. When tackling such questions, always look for the connectivity between landforms and water bodies that you studied in the regional geography modules.

UPSC frequently uses "geographic distractors" to test your mental map. You can confidently eliminate the other options by recalling their global positions: the Bering Strait (between Alaska and Russia), the Cook Strait (separating the islands of New Zealand), and the Taiwan Strait (between China and Taiwan) are all located thousands of miles away from the Indian subcontinent. The trap here is to confuse various famous straits, but by grounding your reasoning in the Indian Ocean region, the Palk Strait remains the only logical choice.