| Firth |
| Inlet |
| Fjord |
| Sea arm |
| Sea inlet |
| River mouth |
| River's end |
| Thames area |
| Ocean inlet |
| Arm of a sea |
| Little sound |
| River-sea link |
| Arm of the sea |
| River-mouth area |
| Broad river mouth |
| Large river mouth |
| Puget Sound, e.g. |
| Tidal river mouth |
| Fjord, for example |
| Chesapeake Bay, e.g. |
| Tidal mouth of a river |
| Wide mouth of a river. |
| Río de la Plata, e.g. |
| Where river and sea meet |
| River-to-ocean connector |
| Chesapeake Bay, for example |
| Lower part of a tidal river |
| Lower tidal part of a river |
| Where a river meets the sea |
| Where salt and fresh water mix |
| Wide lower tidal part of a river |
| Where saltwater and freshwater mix |
| Place where fresh water and salt water mix |
| Wide part of a river where it meets the sea |