General introduction

The South China Sea disputes combine territorial sovereignty, maritime entitlements, resources, and regional order.

The South China Sea is a semi-enclosed sea bordered by China (PRC), Taiwan, Vietnam, the Philippines, Malaysia, Brunei, and Indonesia. The disputes are legally complex because claims to land features, maritime zones, historic rights, continental shelves, fisheries, and navigation operate under different bodies of law.

Why the disputes matter

The South China Sea contains major sea lanes linking Northeast Asia, Southeast Asia, the Indian Ocean, and global markets. It is also a dense fisheries zone, a possible hydrocarbon province, and a stage for naval, coast guard, and maritime militia activity. Legal arguments are therefore inseparable from policy choices about deterrence, crisis management, resource access, and the credibility of international adjudication.

A first-order distinction is essential: sovereignty over land territory is not the same question as maritime entitlement. UNCLOS governs maritime zones, but it does not decide which state owns a disputed island or rock. The 2016 South China Sea Arbitration was structured around that distinction and did not delimit a boundary or award sovereignty over territory.

Claimant matrix

Who claims what

China (PRC) Claimant

Claims sovereignty over the South China Sea island groups, including the Paracels and Spratlys, and maintains maritime rights and interests connected to those features and to historic practice. Its nine-dash or U-shaped line claim remains the central legal controversy.

Paracel Islands
Spratly Islands
Scarborough Shoal
Macclesfield Bank

Taiwan Claimant

Claims the South China Sea islands and administers Taiping Island, also known as Itu Aba, in the Spratlys.

Taiping Island
Spratly Islands
Paracel Islands
Pratas Island

Vietnam Claimant

Claims sovereignty over both the Paracel and Spratly Islands and maritime zones generated from its mainland coast and claimed features.

Paracel Islands
Spratly Islands
Vanguard Bank
Gulf of Tonkin

Philippines Claimant

Claims the Kalayaan Island Group, Bajo de Masinloc or Scarborough Shoal, and maritime zones on the western side of the Philippine archipelago collectively called the West Philippine Sea.

Kalayaan Island Group
Scarborough Shoal
Second Thomas Shoal
Reed Bank

Malaysia Claimant

Claims features and maritime areas in the southern Spratlys, and has made continental shelf submissions connected to the northern part of the South China Sea.

Southern Spratlys
Luconia Shoals
James Shoal area
Extended continental shelf

Brunei Claimant

Asserts maritime entitlements from its coast and has been associated with claims around Louisa Reef and adjacent southern South China Sea areas.

Louisa Reef
Southern Spratlys
Brunei EEZ

Indonesia Affected coastal state

Does not claim Spratly or Paracel sovereignty, but objects to maritime claims that overlap with its lawful EEZ and continental shelf around the Natuna Islands.

Natuna Islands
North Natuna Sea
EEZ enforcement