Biggest Seas located in Atlantic Oceans
| Area in million km2 | |
| Sargasso Sea | 3.5 |
| Caribbean Sea | 2.754 |
| Mediterranean Sea | 2.510 |
| Gulf of Guinea | 2.35 |
| Gulf of Mexico | 1.550 |
| Norwegian Sea | 1.383 |
| Hudson Bay | 1.23 |
| Greenland Sea | 1.205 |
| Argentina Sea | 1 |
| Area in km2 | |
| Labrador Sea | 841,000 |
| Irminger Sea | 780,000 |
| Baffin Bay | 689,000 |
| North Sea | 575,000 |
| Black Sea | 436,000 |
| Baltic Sea | 377,000 |
| Libyan Sea | 350,000 |
| Levantine Sea | 320,000 |
| Celtic Sea | 300,000 |
| Tyrrhenian Sea | 275,000 |
| Gulf of Saint Lawrence | 226,000 |
| Bay of Biscay | 223,000 |
| Aegean Sea | 214,000 |
| Ionian Sea | 169,000 |
| Balearic Sea | 150,000 |
| Adriatic Sea | 138,000 |
| Gulf of Bothnia | 116,300 |
| Sea of Crete | 95,000 |
| Gulf of Maine | 93,000 |
| Ligurian Sea | 80,000 |
| English Channel | 75,000 |
| James Bay | 68,300 |
| Bothnian Sea | 66,000 |
| Gulf of Sidra | 57,000 |
| Sea of the Hebrides | 47,000 |
| Irish Sea | 46,000 |
| Sea of Azov | 39,000 |
| Bothnian Bay | 36,800 |
| Gulf of Venezuela | 17,840 |
| Bay of Campeche | 16,000 |
| Gulf of Lion | 15,000 |
| Sea of Marmara | 11,350 |
| Wadden Sea | 10,000 |
| Archipelago Sea | 8,300 |