| Rank | Country | Maritime claims |
| Gabon | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm |
| Gambia, The | territorial sea: 12 nm contiguous zone: 18 nm exclusive fishing zone: 200 nm continental shelf: extent not specified |
| Gaza Strip | see entry for Israel note: effective 3 January 2009 the Gaza maritime area is closed to all maritime traffic and is under blockade imposed by Israeli Navy until further notice |
| Georgia | territorial sea: 12 nm exclusive economic zone: 200 nm |
| Germany | territorial sea: 12 nm exclusive economic zone: 200 nm continental shelf: 200 m depth or to the depth of exploitation |
| Ghana | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm continental shelf: 200 nm |
| Gibraltar | territorial sea: 3 nm |
| Greece | territorial sea: 12 nm continental shelf: 200 m depth or to the depth of exploitation |
| Greenland | territorial sea: 3 nm exclusive fishing zone: 200 nm or agreed boundaries or median line continental shelf: 200 nm or agreed boundaries or median line |
| Grenada | territorial sea: 12 nm exclusive economic zone: 200 nm |
| Guam | territorial sea: 12 nm exclusive economic zone: 200 nm |