The Kitsap Peninsula /ˈkɪtˌsɑːp/ lies west of Seattle across Puget Sound, in Washington state in the northwestern US. Hood Canal separates the peninsula from the Olympic Peninsula on its west side. The peninsula, aka "the Kitsap", encompasses all of Kitsap County except Bainbridge and Blake Islands, as well as the northeastern part of Mason County and the northwestern part of Pierce County. The highest point on the Kitsap Peninsula is Gold Mountain. The U.S.