| Rank | Country | Maritime claims |
| Sri Lanka | territorial sea: 12 nm
contiguous zone: 24 nm
exclusive economic zone: 200 nm
continental shelf: 200 nm or to the edge of the continental margin |
| Sudan | territorial sea: 12 nm
contiguous zone: 18 nm
continental shelf: 200 m depth or to the depth of exploitation |
| Suriname | territorial sea: 12 nm
exclusive economic zone: 200 nm |
| Svalbard | territorial sea: 4 nm
exclusive fishing zone: 200 nm unilaterally claimed by Norway but not recognized by Russia |
| Swaziland | none (landlocked) |
| Sweden | territorial sea: 12 nm (adjustments made to return a portion of straits to high seas)
exclusive economic zone: agreed boundaries or midlines
continental shelf: 200-m depth or to the depth of exploitation |
| Switzerland | none (landlocked) |
| Syria | territorial sea: 12 nm
contiguous zone: 24 nm |
| Taiwan | territorial sea: 12 nm
exclusive economic zone: 200 nm |
| Tajikistan | none (landlocked) |
| Tanzania | territorial sea: 12 nm
exclusive economic zone: 200 nm |
| Thailand | territorial sea: 12 nm
exclusive economic zone: 200 nm
continental shelf: 200-m depth or to the depth of exploitation |
| Timor-Leste | territorial sea: 12 nm
contiguous zone: 24 nm
exclusive fishing zone: 200 nm |
| Togo | territorial sea: 30 nm
exclusive economic zone: 200 nm |
| Tokelau | territorial sea: 12 nm
exclusive economic zone: 200 nm |
| Tonga | territorial sea: 12 nm
exclusive economic zone: 200 nm
continental shelf: 200-m depth or to the depth of exploitation |
| Trinidad and Tobago | measured from claimed archipelagic baselines
territorial sea: 12 nm
contiguous zone: 24 nm
exclusive economic zone: 200 nm
continental shelf: 200 nm or to the outer edge of the continental margin |
| Tunisia | territorial sea: 12 nm
contiguous zone: 24 nm
exclusive economic zone: 12 nm |
| Turkey | territorial sea: 6 nm in the Aegean Sea; 12 nm in Black Sea and in Mediterranean Sea
exclusive economic zone: in Black Sea only: to the maritime boundary agreed upon with the former USSR |
| Turkmenistan | none (landlocked) |
| Turks and Caicos Islands | territorial sea: 12 nm
exclusive fishing zone: 200 nm |
| Tuvalu | territorial sea: 12 nm
contiguous zone: 24 nm
exclusive economic zone: 200 nm |
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