Directly seaward of the continental shelf is a more steeply sloping region called the: mid-ocean ridge. continental rise. trench. abyssal plain. continental slope.

Continental slope

Explanation:

Continental slope is known as the boundary (usually seaward) of a typical continental shelf. This is also the region that is located seaward and extends at approximately 2890 to 3980 m. The continental shelf also stands as a separation between the ocean and a continental self. Therefore, based on the description, the correct is continental slope.