| Rank | Country | Maritime claims |
| Jamaica | measured from claimed archipelagic straight baselines territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm continental shelf: 200 nm or to edge of the continental margin |
| Jan Mayen | territorial sea: 4 nm contiguous zone: 10 nm exclusive economic zone: 200 nm continental shelf: 200 m depth or to the depth of exploitation |
| Japan | territorial sea: 12 nm; between 3 nm and 12 nm in the international straits - La Perouse or Soya, Tsugaru, Osumi, and Eastern and Western Channels of the Korea or Tsushima Strait contiguous zone: 24 nm exclusive economic zone: 200 nm |
| Jersey | territorial sea: 3 nm exclusive fishing zone: 12 nm |
| Jordan | territorial sea: 3 nm |
| Kazakhstan | none (landlocked) |
| Kenya | territorial sea: 12 nm exclusive economic zone: 200 nm continental shelf: 200 m depth or to the depth of exploitation |
| Kiribati | territorial sea: 12 nm exclusive economic zone: 200 nm |
| Korea, North | territorial sea: 12 nm exclusive economic zone: 200 nm note: military boundary line 50 nm in the Sea of Japan and the exclusive economic zone limit in the Yellow Sea where all foreign vessels and aircraft without permission are banned |
| Korea, South | territorial sea: 12 nm; between 3 nm and 12 nm in the Korea Strait contiguous zone: 24 nm exclusive economic zone: 200 nm continental shelf: not specified |
| Kosovo | none (landlocked) |
| Kuwait | territorial sea: 12 nm |
| Kyrgyzstan | none (landlocked) |
| Laos | none (landlocked) |
| Latvia | territorial sea: 12 nm exclusive economic zone: 200 nm continental shelf: 200 m depth or to the depth of exploitation |
| Lebanon | territorial sea: 12 nm |
| Lesotho | none (landlocked) |
| Liberia | territorial sea: 200 nm |
| Libya | territorial sea: 12 nm note: Gulf of Sidra closing line - 32 degrees, 30 minutes north exclusive fishing zone: 62 nm |
| Liechtenstein | none (landlocked) |
| Lithuania | territorial sea: 12 nm |
| Luxembourg | none (landlocked) |
| Macau | not specified |
| Macedonia | none (landlocked) |
| Madagascar | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm continental shelf: 200 nm or 100 nm from the 2,500-m isobath |
| Malawi | none (landlocked) |
| Malaysia | territorial sea: 12 nm exclusive economic zone: 200 nm continental shelf: 200 m depth or to the depth of exploitation; specified boundary in the South China Sea |