| Rank | Country | Maritime claims |
| Cameroon | territorial sea: 12 nm contiguous zone: 24 nm |
| Canada | 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 |
| Cape Verde | measured from claimed archipelagic baselines territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm |
| Cayman Islands | territorial sea: 12 nm exclusive fishing zone: 200 nm |
| Central African Republic | none (landlocked) |
| Chad | none (landlocked) |
| Chile | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm continental shelf: 200/350 nm |
| China | 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 |
| Christmas Island | territorial sea: 12 nm contiguous zone: 12 nm exclusive fishing zone: 200 nm |
| Clipperton Island | territorial sea: 12 nm exclusive economic zone: 200 nm |
| Cocos (Keeling) Islands | territorial sea: 12 nm exclusive fishing zone: 200 nm |
| Colombia |  territorial sea: 12 nm exclusive economic zone: 200 nm continental shelf: 200 m depth or to the depth of exploitation |