I don't think it is the continental shelf
The two major regions are the continental margin and the deep-ocean basin.
The continental margin and the deep ocean basin
the continental Margin, Ocean Basin Floor and Mid-Ocean ridge :D
continental margin deep-ocean basin
the continental Margin, Ocean Basin Floor and Mid-Ocean ridge :D
The continental margin is the zone of the ocean floor that separates the thin oceanic crust from thick continental crust.
A continental margin is the zone of transition between a continent and the deep ocean floor. It includes the continental shelf, continental slope, and continental rise. It is an area where sediments from the continent are deposited and tectonic activity can occur.
The Atlantic ocean.
The steep area between the continental shelf and the ocean floor is called the continental margin. A continental margin is usually composed of a steep continental slope that is followed by the flatter continental rise.
The landforms that extends into the ocean or sea is known as the continental shelf. The edges of the continental shelf are marked by a steep drop off into the ocean depths.
continental shelf peninsula
On an active continental margin, you would be likely to find an active ocean trench. This structure would generally not occur at a passive continental margin.