Willapa Bay is fairly shallow: more than half of its surface area lies in the intertidal zone, and half of the volume of water inside it enters and leaves with every tide.

citation

Wikipedia contributors. (2023, February 2). Willapa Bay. In Wikipedia, The Free Encyclopedia. Retrieved February 11, 2024, from https://en.wikipedia.org/w/index.php?title=Willapa_Bay&oldid=1136958734

Willapa Bay (Wikipedia) Willapa Bay (/ˈwɪləpɑː/) is a bay located on the southwest Pacific coast of Washington state in the United States. The Long Beach Peninsula separates Willapa Bay from the greater expanse of the Pacific Ocean. With over 120 square miles (310 km2) of surface area Willapa Bay is the second-largest riverine estuary on the Pacific coast of the continental United States. Early settlers called the bay Shoalwater Bay and this name is found on old maps and charts of the region.