I think that's called a lagoon.
It's more likely to be a peninsula.
An area of land bordered on three sides by water is a peninsula.
A Bay is a piece of water with land on three sides.
check
Water on two sides - isthmus Water on three sides - peninsula Water on all four sides - island I don't think there is a separate name for a land with three side land and one side water, but you could call it a protected shore, or beach, or a cove I suppose.
A bay is a body of water that is surrounded on three sides by land. A peninsula is a land mass surrounded on three sides by water
By water, one. By land, three.
A piece of land that's surrounded by water on three sides is usually called a peninsula.
A coast, or a seacoast, or beach, has land on three sides and water on the other.A piece of land surrounded by water on approximately three sides is a peninsula, which may also be a cape, promontory, or point.
a peninsula
Peninsula.
Gulf
a peninsula... it is surrounded by water on three sides but has land on the fourth... example: Florida