A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water known as a shelf sea. Much of the shelves were exposed during glacial periods and interglacial periods.

Shallow water zone of intertidal area on the continental shelf is called as? Okie... think carefully first, then make a decision:
To answer the question, consider the following: A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water known as a shelf sea. So, the answer is a shelf sea.