It could be a Norwegian Fjord, a Scottish sea-loch, an inlet, a narrow bay. Even a river estuary (the River Mersey, England, is one example), where sea-water is mixed with river water to form brine, yet the estuary is still enclosed partly by land.
sea
A portion of ocean that is enclosed or partly enclosed by land? ✓ sea
Either gulf or a sea
A sea a portion of ocean that is enclosed or partly enclosed by land
A sea a portion of ocean that is enclosed or partly enclosed by land
sea It's a sea or an ocean.
a body of water
Sound
Either gulf or a sea
delta
bay
A gulf is a portion of ocean or sea partly enclosed by land. A Peninsula is an area of land almost completely surrounded by water