Sixteen sovereign states and territories have coastlines on both the Atlantic Ocean (proper) and the Caribbean Sea. The boundary runs roughly along the Greater Antilles arc and the Lesser Antilles chain.
| Country / Territory | Atlantic Coast | Caribbean Coast | |
|---|---|---|---|
| Antigua & Barbuda | East (Barbuda) | West (Antigua) | |
| Bahamas | Entire archipelago | Southwest banks | |
| Barbados | East coast | West coast (calmer) | |
| Bermuda (UK) | Entire platform | N/A (Sargasso Sea) | |
| Cuba | North coast | South coast | |
| Dominica | East | West | |
| Dominican Republic | North (Atlantic) | South (Caribbean) | |
| Grenada | East | West | |
| Haiti | North | South | |
| Jamaica | North | South | |
| Puerto Rico (US) | North | South | |
| St. Kitts & Nevis | East (Atlantic) | West (Caribbean) | |
| St. Lucia | East | West | |
| St. Vincent & Grenadines | East | West | |
| Trinidad & Tobago | East (Atlantic) | West (Gulf of Paria/Caribbean) | |
| United States (Florida) | East (Atlantic) | South/West (Gulf/Straits) |