Harstine

Harstine Island (also known simply as Harstine or Harstene) is an island in Mason County, Washington, United States. The US Census recognizes it as an unincorporated community.The island is located west of Case Inlet in southern Puget Sound, 16 km (9.9 mi) north of Olympia. It has a land area of 48.305 km2 (18.651 sq mi), and had a population of 1,002 as of the 2000 census.

Pickering Passage, to the northwest, separates the island from mainland, while Case Inlet, to the east, separates it from Key Peninsula. Squaxin Island lies to the southwest, separated by Peale Passage. To the south, Harstine Island is separated from the mainland by Dana Passage.