Cultus Bay is at the southern end of Whidbey Island between Scatchet Head and Possession Point in southern Island County. It is a shallow bay, flooded only at high tides. It was named by George Davidson of U.S. Coast Survey. He found the bay to be of no value for navigation becoming mud flats at low tide. A local name, no longer in use, was Bailey’s Bay. (Smith, A.J. p. 4).