Puget Sound itself is a body of water lying east of Admiralty Inlet, through which ocean waters reach inland some 50 miles from the Pacific Coast to provide all-weather ports for ocean-going ships at Seattle, Tacoma and Olympia.  The waterway is a complex and intricate system of channels, inlets, estuaries, embayments and islands. Common usage has broadened the Sound's description to include the surrounding lowlands extending east to the CascadeMountains and the various cities and towns lying therein.  Such usage also includes Whidbey, Camino, and Fidalgo islands as well as the Kitsap Peninsula.