The intertidal zone, also known as the foreshore and seashore and sometimes referred to as the littoral zone, is the area that is above water at low tide and under water at high tide (in other words, the area between tide marks).
The neritic zone is the relatively shallow part of the ocean above the drop-off of the continental shelf, approximately 200 metres in depth.
The oceanic zone begins in the area off shore where the water measures 200 meters (656 feet) deep or deeper and extends to the ocean floor. It is the region of open sea beyond the edge of the continental shelf and includes 65% of the ocean's completely open water.