Hat Island, also known as Gedney Island, is a small island in Possession Sound in the U.S. state of Washington. The island is covered by a census-designated place (CDP) that is part of Snohomish County. The population was 41 at the 2010 census. The island lies between the mainland city of Everett, Washington, and the southern part of Whidbey Island; it has a land area of 1.768 km2.

Camano Island is a large island in Possession Sound, a section of Puget Sound. It is part of Island County, Washington, and is located between Whidbey Island and the mainland by the Saratoga Passage to the west and Port Susan and Davis Slough to the east. The island has one road connection to the mainland, via State Route 532 over the Camano Gateway Bridge at the northeast end of the island, connecting to the city of Stanwood.