Wednesday Island is a low-lying island contained within Morro Bay, California. The island is just east of the sand spit separating Morro Bay from the Pacific Ocean. Wednesday Island is about 300 meters across, but is surrounded by very shallow water which may expose mud flats at low tide. It is just west of the Morro Dunes Natural Preserve and just outside of the Morro Bay Wildlife Area, which protects 1,300 acres of tidal mud flats in the southern half of the bay. A variety of native seabirds inhabit the area surrounding the island, including the western gull and the Snowy plover. Wednesday island is by far the largest of the three Morro Bay mud flat islands, such as the nearby Unit Island.