It is called the Continental Shelf
The steep side of the edge of a continent is called a continental slope. This feature marks the transition between the continental shelf and the deep ocean floor.
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The steep side of a dune is called the slip face. It is the side of the dune where sand grains are deposited as they slide down due to gravity.
Slip face.
A hill with a steep side is called a bluff. Bluffs can be found along coastlines or riverbanks, and they often offer scenic views due to their height and steepness.
An edge.
An edge.
The side of a sand dune facing the ocean is called leeward.
It is called a side or edge.
It is an edge.
The gunnel.
An edge.