 Sometimes the terms "Puget Sound" and "Puget Sound and adjacent waters" are used for not only Puget Sound proper but also for waters to the north, such as Bellingham Bay and the San Juan Islands region.The term "Puget Sound" is used not just for the body of water but also the Puget Sound region centered on the sound.Major cities on the sound include Seattle, Tacoma, Olympia, and Everett, Washington.