| Rank | Country | Maritime claims |
| Italy | 
territorial sea: 12 nm
continental shelf: 200-m depth or to the depth of exploitation |
| 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 |
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