Which among the following islands in the South China Sea are the source of conflict between several countries?

1. UNCLOS and Maritime Zones (basic)

To understand how the world's oceans are governed, we look to the United Nations Convention on the Law of the Sea (UNCLOS), often described as the 'Constitution of the Oceans.' Before UNCLOS, the sea was a chaotic space of 'freedom' where powerful nations could claim as much as they could defend. Established in 1982, UNCLOS created a standardized framework dividing the ocean into specific zones based on distance from a country's baseline (the low-water mark along the coast). For a maritime nation like India, which possesses a massive 7,500 km coastline and relies on the sea for 90% of its trade volume, these zones are critical for both security and economic survival Vivek Singh, Indian Economy, Infrastructure and Investment Models, p.419.

The first major zone is the Territorial Sea, extending 12 nautical miles (nm) from the baseline. Within this area, a state enjoys full sovereignty—meaning its national laws apply to the water, the seabed, and even the airspace above M. Laxmikanth, Indian Polity, Rights and Liabilities of the Government, p.551. However, there is one key exception: Innocent Passage, which allows foreign ships to pass through as long as they aren't threatening the coastal state's security. Beyond this lies the Contiguous Zone (up to 24 nm), where a country can enforce laws related to customs, taxation, immigration, and pollution.

The most economically significant area is the Exclusive Economic Zone (EEZ), stretching up to 200 nautical miles. Here, the coastal state does not have full sovereignty (it cannot stop ships from sailing through), but it has sovereign rights over all natural resources. This includes fishing, mining, and oil extraction. In India, all 'sea-wealth' found in the territorial waters or the EEZ vests in the Union government rather than individual coastal states M. Laxmikanth, Indian Polity, Rights and Liabilities of the Government, p.551. This 'economic territory' also extends to Indian-operated oil rigs and fishing vessels even when they operate in international waters Vivek Singh, Indian Economy, Fundamentals of Macro Economy, p.15.

Zone	Distance from Baseline	Key Rights/Control
Internal Waters	Landward of baseline	Full sovereignty (no innocent passage).
Territorial Sea	0 to 12 nm	Sovereignty over water, air, and soil; allows innocent passage.
Contiguous Zone	12 to 24 nm	Limited power to prevent/punish infringement of customs/fiscal laws.
Exclusive Economic Zone	0 to 200 nm	Sovereign rights over resources; freedom of navigation for others.
High Seas	Beyond 200 nm	Common heritage of mankind; no single nation has jurisdiction.

Sources: Indian Economy, Vivek Singh, Infrastructure and Investment Models, p.419; Indian Polity, M. Laxmikanth, Rights and Liabilities of the Government, p.551; Indian Economy, Vivek Singh, Fundamentals of Macro Economy, p.15

2. Strategic Chokepoints and SLOCs (basic)

To understand global trade and geopolitics, we must first look at the ocean not as a uniform body of water, but as a network of 'maritime highways' known as Sea Lines of Communication (SLOCs). While the open ocean is vast, ships follow specific routes to minimize distance and cost. However, geography often forces these routes through narrow passages called Strategic Chokepoints. These are naturally occurring bottlenecks—like straits or man-made canals—where a high volume of global traffic is squeezed into a small area. As noted in Geography of India, India–Political Aspects, p.64, the Indian Ocean is unique because its access is restricted by such narrow outlets, meaning its entire maritime traffic can be 'choked' if these points are controlled.

The importance of these points cannot be overstated: roughly 90% of global trade by volume is moved via maritime logistics Indian Economy, Infrastructure and Investment Models, p.419. If a single chokepoint is blocked—whether by conflict, piracy, or an accident—it creates a domino effect on global supply chains and energy security. For instance, before the Suez Canal opened in 1869, ships traveling from India to Europe had to navigate thousands of extra miles around the Cape of Good Hope at the southern tip of Africa Geography of India, India–Political Aspects, p.64.

Below are the primary chokepoints that define global maritime strategy today:

Chokepoint	Connectivity	Strategic Significance
Strait of Hormuz	Persian Gulf & Arabian Sea	The world's most critical oil transit point.
Strait of Malacca	Indian Ocean & South China Sea	The shortest route for trade between Europe/India and East Asia.
Bab-al-Mandeb	Red Sea & Gulf of Aden	The 'Gate of Tears'—essential for traffic entering the Suez Canal.
Bering Strait	Arctic Ocean & Pacific Ocean	Closest strait to the International Date Line Physical Geography by PMF IAS, Latitudes and Longitudes, p.247.

Sources: Geography of India, India–Political Aspects, p.64; Indian Economy, Infrastructure and Investment Models, p.419; Physical Geography by PMF IAS, Latitudes and Longitudes, p.247

3. The Island Chain Strategy (intermediate)

To understand the Island Chain Strategy, we must first look at the physical geography of the Pacific Ocean. Geologically, much of the western Pacific is characterized by Island Arcs (also called festoons). These are narrow, curved chains of volcanic islands formed by Ocean-Ocean Convergence, where a denser tectonic plate subducts under a lighter one Physical Geography by PMF IAS, Convergent Boundary, p.111. These natural formations, such as the Ryukyu Islands and the Japanese Archipelago, do not just exist as geological wonders; they form a natural maritime barrier that separates the coastal seas of Asia from the open Pacific Ocean Certificate Physical and Human Geography, Islands and Coral Reefs, p.97.
The "Island Chain Strategy" is a geopolitical concept that uses these physical formations to define maritime boundaries and control naval access. It is essentially Resource Geopolitics in action—the idea that sea power rests on controlling maritime navigation and strategic bottlenecks NCERT Class XII, Environment and Natural Resources, p.92. The strategy is divided into three layers:

• The First Island Chain: This is the most critical line. It begins at the Kuril Islands in the north, runs through the Japanese archipelago, the Ryukyu Islands, Taiwan, and the northern Philippines, ending near Borneo. It acts as the primary "fence" or gateway to the South China and East China Seas.
• The Second Island Chain: Located further east, this line runs from the Bonin Islands through the Mariana Islands (including Guam) and down to Western New Guinea. This serves as a second line of defense and a base for deep-sea operations.
• The Third Island Chain: This chain is anchored by the Hawaiian Islands and reaches toward the Aleutian Islands, representing the final layer of maritime control in the Central Pacific.

Understanding these chains helps us see why certain islands—like the Kurils or the Ryukyus—are not just dots on a map but strategic pillars. For example, the Kurile Islands are part of a volcanic loop marking the edge of the continent, and their control determines who can move freely from the Sea of Okhotsk into the wider Pacific Certificate Physical and Human Geography, Islands and Coral Reefs, p.97. When a nation controls an island chain, they control the "choke points" (the narrow straits between islands), effectively deciding who gets "what, when, where, and how" in terms of maritime trade and security.

Chain Layer	Key Geographic Markers	Strategic Role
First Chain	Kurils, Japan, Ryukyus, Taiwan, Philippines	Containment/Access to East & South China Seas
Second Chain	Bonin Islands, Guam (Marianas), Palau	Forward projection & Mid-Pacific surveillance
Third Chain	Hawaii, Aleutians	Final defensive line & Logistical hub

Sources: Physical Geography by PMF IAS, Convergent Boundary, p.111; Certificate Physical and Human Geography (GC Leong), Islands and Coral Reefs, p.97; NCERT Class XII (Contemporary World Politics), Environment and Natural Resources, p.92

4. Geopolitics of the South Pacific (Solomon & Marshall Islands) (intermediate)

The South Pacific is no longer just a remote "maritime backwater"; it has emerged as a vital arena of geopolitical competition between major global powers. To understand this, we must look at the Marshall Islands and the Solomon Islands, two nations with very different strategic trajectories. The Marshall Islands, located in Micronesia, are fundamentally coral atolls — low-lying islands built by coral polyps that emerge just above the sea surface (Certificate Physical and Human Geography, Chapter 11, p.98). Their strategic identity is defined by the Compact of Free Association (COFA) with the United States, which grants the US exclusive military access to their vast territorial waters in exchange for economic assistance and defense guarantees.

In contrast, the Solomon Islands in Melanesia have recently become the "eye of the storm" in the Indo-Pacific rivalry. For decades, they maintained close ties with the West and recognized Taiwan. However, in 2019, the Solomon Islands officially switched diplomatic recognition to the People’s Republic of China (History, class XII (TN), p.253). This shift culminated in a 2022 security pact with Beijing, which sparked fears among "Quad" nations (India, US, Japan, and Australia) regarding a potential Chinese naval presence in the South Pacific, echoing China's "String of Pearls" expansion in the Indian Ocean (Geography of India, p.72).

For these Large Ocean States, the primary existential threat is not just military, but environmental. As low-lying coral formations, they are highly vulnerable to rising sea levels, leading them to be proactive in international climate agreements like the Doha Amendment (Environment, Shankar IAS, p.330). Their strategy today is to leverage their strategic location to secure both security and climate-resilient infrastructure from competing superpowers.

Feature	Marshall Islands	Solomon Islands
Region	Micronesia	Melanesia
Geology	Coral Atolls	Volcanic & Coral mix
Key Partner	United States (COFA)	Growing ties with China

Sources: Certificate Physical and Human Geography, Islands and Coral Reefs, p.98; History, class XII (Tamilnadu state board 2024 ed.), The World after World War II, p.253; Geography of India (Majid Husain), India–Political Aspects, p.72; Environment, Shankar IAS Academy, Climate Change Organizations, p.330

5. North Pacific Disputes: The Kuril Islands (intermediate)

The Kuril Islands are a volcanic archipelago in the North Pacific, stretching approximately 1,300 km from the Japanese island of Hokkaido to the Russian Kamchatka Peninsula. Geographically, they serve as a strategic barrier separating the Sea of Okhotsk from the open Pacific Ocean. While the entire chain consists of 56 islands, the heart of the modern geopolitical friction lies in the four southernmost islands—Iturup (Etorofu), Kunashir (Kunashiri), Shikotan, and the Habomai islets—which Japan refers to as its 'Northern Territories'.

The roots of this dispute are deeply tied to the shift in power during the 20th century. Following Japan's victory in the Russo-Japanese War (1904-05), Japan asserted significant influence in the region History, class XII (Tamilnadu state board 2024 ed.), Imperialism and its Onslaught, p.199. However, the tide turned during World War II. As the war drew to a close, the Allied powers decided that Japan would be stripped of territories it had gained through past aggression History, class XII (Tamilnadu state board 2024 ed.), Outbreak of World War II and its Impact in Colonies, p.229. In the final days of the war in 1945, the Soviet Union occupied the Kuril Islands. To this day, a formal peace treaty ending WWII has never been signed between Russia and Japan, primarily because of their inability to resolve the sovereignty of these four islands.

For a UPSC aspirant, it is vital to understand the strategic significance of this dispute. For Russia, these islands ensure year-round access to the Pacific Ocean for its navy, as the Sea of Okhotsk becomes a 'Russian lake.' For Japan, the dispute is a matter of national sovereignty and access to rich fishing grounds. The islands represent one of the last unresolved territorial legacies of the Second World War in East Asia.

Sources: History, class XII (Tamilnadu state board 2024 ed.), Imperialism and its Onslaught, p.199; History, class XII (Tamilnadu state board 2024 ed.), Outbreak of World War II and its Impact in Colonies, p.229; Themes in world history, History Class XI (NCERT 2025 ed.), Paths to Modernisation, p.170

6. South China Sea: The Nine-Dash Line (exam-level)

The South China Sea is one of the most strategically significant bodies of water in the world, serving as a critical maritime gateway for global trade and a reservoir of vast oil and natural gas reserves. At the heart of the regional tension lies the Nine-Dash Line, a U-shaped demarcation used by the People's Republic of China (and Taiwan) to claim 'historical rights' over nearly 80-90% of the sea's territory. This claim encompasses several archipelagos, most notably the Spratly Islands and the Paracel Islands, leading to overlapping territorial assertions by Vietnam, the Philippines, Malaysia, and Brunei. While China's land-based disputes, such as those regarding the McMahon Line or Aksai Chin (Majid Husain, Geography of India, India–Political Aspects, p.34), focus on terrestrial watersheds and historical treaties, the Nine-Dash Line is unique as it challenges established international maritime law. Under the United Nations Convention on the Law of the Sea (UNCLOS), nations are typically granted an Exclusive Economic Zone (EEZ) of 200 nautical miles from their coast. China’s Nine-Dash Line, however, cuts deep into the EEZs of its neighbors. To solidify these claims, China has engaged in 'land reclamation'—building artificial islands on submerged reefs like Mischief Reef and Fiery Cross Reef—and installing military infrastructure. This 'salami-slicing' tactic aims to change the facts on the ground (or in the water) incrementally. In 2016, the Permanent Court of Arbitration (PCA) ruled that the Nine-Dash Line had no legal basis under UNCLOS, a verdict China has consistently refused to recognize.

Feature	Nine-Dash Line Claim	UNCLOS Framework
Basis	Historical rights and ancient maps.	Distance-based (12nm territorial sea; 200nm EEZ).
Geography	Encompasses ~80% of the South China Sea.	Defined by a country's coastline.
Legal Standing	Rejected by the 2016 PCA ruling.	Globally recognized maritime law.

Sources: Geography of India, India–Political Aspects, p.34

7. Spratly and Paracel Islands: Geography of Conflict (exam-level)

The South China Sea is one of the most strategically significant maritime crossroads in the world, primarily due to the Spratly and Paracel Islands. These are not large, continental landmasses but are largely oceanic islands consisting of coral reefs, cays, and atolls. According to GC Leong, Islands and Coral Reefs, p.102, oceanic islands are those that rise from the deep ocean floor and have no connection to the mainland. In the case of the Spratlys, many features are atolls—circular or semi-circular reefs that develop as coral builds upward on subsiding sea platforms Environment, Shankar IAS Academy, Aquatic Ecosystem, p.51.

The conflict arises because these tiny features are the basis for massive maritime claims. China asserts sovereignty over nearly the entire sea via its 'Nine-Dash Line', a claim that overlaps with the Exclusive Economic Zones (EEZ) of several ASEAN nations. The geography of the dispute is generally divided into two sectors:

Feature	Location	Primary Claimants
Paracel Islands	Northern part of the South China Sea, closer to Vietnam and China.	China, Vietnam, and Taiwan.
Spratly Islands	Southern part of the South China Sea, spread over a vast area.	China, Vietnam, Philippines, Malaysia, Brunei, and Taiwan.

A defining physical change in this region is land reclamation. Using dredging technology, nations (most notably China) have converted submerged reefs, such as Mischief Reef and Fiery Cross Reef, into artificial islands capable of supporting military infrastructure. This turns what were once naturally occurring "low-tide elevations" into strategic outposts. It is vital to distinguish these from other Pacific disputes; for instance, the Kuril Islands dispute involves Russia and Japan in the North Pacific, while the Marshall Islands are sovereign nations in the South Pacific with no involvement in the South China Sea territorial claims.

Sources: Certificate Physical and Human Geography, GC Leong, Islands and Coral Reefs, p.102; Environment, Shankar IAS Academy, Aquatic Ecosystem, p.51

8. Solving the Original PYQ (exam-level)

This question is a classic application of the Geopolitics of the Indo-Pacific and Maritime Territorial Disputes that you have just studied. To solve it, you must synthesize your knowledge of regional geography with current international flashpoints. The core building block here is understanding how the Nine-Dash Line intersects with the sovereignty claims of various Southeast Asian nations. By identifying the specific geographical theater mentioned—the South China Sea—you can narrow down which island chains serve as the primary epicenter for multi-country friction over maritime resources and strategic influence.

To arrive at the correct answer, use a step-by-step spatial analysis. First, filter the options based on the specific body of water: the South China Sea. While many islands in the Pacific are subject to geopolitical interest, only the Spratly Islands (Option D) involve a complex, multi-lateral conflict between China, Vietnam, the Philippines, Malaysia, and Brunei. These islands are strategically vital due to potential oil and gas reserves and critical shipping lanes. Your reasoning path should lead you to identify the Spratlys as the only option where large-scale land reclamation and overlapping EEZ claims create a persistent international crisis.

UPSC often employs geographical proximity traps to test your precision. For instance, the Marshall Islands and Solomon Islands are frequently in the news due to evolving security pacts, but they are located in the South Pacific, not the South China Sea. Similarly, the Kuril Islands represent a major territorial flashpoint, but they are part of a bilateral dispute between Russia and Japan in the North Pacific. By recognizing these regional distractors and keeping your focus on the specific maritime zone defined in the question, you can confidently conclude that the Spratly Islands is the correct answer. Source: Wikipedia: Spratly Islands dispute