The United States Geological Survey defines the Puget Sound as a bay, with numerous channels and branches. It extends 144 km (90 mi) south from the Strait of Juan de Fuca to Olympia, Washington; the northern boundary is formed, at its main entrance, by a line between Point Wilson on the Olympic Peninsula and Partridge on Whidbey Island; at a second entrance, between West Point on Whidbey Island, Deception Island, and Rosario Head on Fidalgo Island; at a third entrance, the south end of Swinomish Channel between Fidalgo Island and McGlinn Island [1]
Principal cities in the region are Seattle, Tacoma, Olympia, Everett, Bremerton, Port Orchard, and Anacortes.
U.S. Counties along Puget Sound: