Marine and Coastal Landforms

Named landforms shaped by or found within the ocean: a coral reef system such as the Great Barrier Reef, or a deep oceanic trench such as the Mariana Trench. Belongs here: a named reef, trench or comparable marine or coastal landform. Does not belong here: the ocean or sea itself, held under bodyofwater, or a peninsula or other coastal landmass feature, held under Peninsulas.