| Rank | Country | Maritime claims |
| Maldives | measured from claimed archipelagic straight baselines territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm |
| Mali | none (landlocked) |
| Malta | territorial sea: 12 nm contiguous zone: 24 nm continental shelf: 200 m depth or to the depth of exploitation exclusive fishing zone: 25 nm |
| Marshall Islands | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm |
| Mauritania | 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 |
| Mauritius | measured from claimed archipelagic straight baselines territorial sea: 12 nm exclusive economic zone: 200 nm continental shelf: 200 nm or to the edge of the continental margin |
| Mayotte | territorial sea: 12 nm exclusive economic zone: 200 nm |
| Mexico | 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 |
| Micronesia, Federated States of | territorial sea: 12 nm exclusive economic zone: 200 nm |
| Moldova | none (landlocked) |
| Monaco | territorial sea: 12 nm exclusive economic zone: 12 nm |
| Mongolia | none (landlocked) |
| Montenegro | territorial sea: 12 nm continental shelf: defined by treaty |
| Montserrat | territorial sea: 3 nm exclusive fishing zone: 200 nm |
| Morocco | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm continental shelf: 200 m depth or to the depth of exploitation |
| Mozambique | territorial sea: 12 nm exclusive economic zone: 200 nm |
| Namibia | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm |
| Nauru | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm |
| Navassa Island | territorial sea: 12 nm exclusive economic zone: 200 nm |
| Nepal | none (landlocked) |
| Netherlands | territorial sea: 12 nm contiguous zone: 24 nm exclusive fishing zone: 200 nm |
| Netherlands Antilles | territorial sea: 12 nm exclusive fishing zone: 12 nm |
| New Caledonia | territorial sea: 12 nm exclusive economic zone: 200 nm |