 Its average depth is  and its maximum depth, off Jefferson Point between Indianola and Kingston, is .The depth of the main basin, between the southern tip of Whidbey Island and Tacoma, Washington, is approximately .In 2009, the term Salish Sea was established by the United States Board on Geographic Names as the collective waters of Puget Sound, the Strait of Juan de Fuca, and the Strait of Georgia.