general/coastal-and-oceanic-landforms
Surf Wiki
Coastal plain
Area of flat, low-lying land adjacent to a seacoast
Geo (landform)
Inlet, a gully or a narrow and deep cleft in the face of a cliff
Ria
Coastal inlet formed by the partial submergence of an unglaciated river valley
Arm (geography)
Narrow extension of water extending from a larger body of water