What is the term part of the ocean or sea that cuts far into the boarding land mass

The part of the ocean or sea that cuts far into the adjacent land mass is often referred to as a "shelf" or "plateau", since it is simply an extension of the land mass that makes up the area above the water. 

3is faulse becaues the big so that wpuld mean thtmat they are farther apart.

Ithink it's f if it's not then it is c a