The steep area between the continental shelf and the ocean floor is called the continental slope.

Here's a breakdown:

* Continental shelf: The gently sloping, submerged extension of a continent.

* Continental slope: A relatively steep drop-off that marks the transition between the shelf and the deep ocean floor.

* Ocean floor: The deep, flat expanse of the ocean basin.

The continental slope is a dynamic area where sediment from the shelf accumulates and is transported to the ocean floor. It's also characterized by canyons, submarine landslides, and other geological features formed by erosion and tectonic activity.