"Colvos Passage Marine Preserve Area" is defined as those waters and bedlands of Colvos Passage enclosed by a line starting at extreme low water on the west shore at 47°20.87'N, thence due east 300 feet, thence southwesterly paralleling the shore for 500 feet, thence due west to the extreme low water line, thence northeasterly along the extreme low water line to the point of origin.