Possession Sound is part of Puget Sound, located in the U.S. state of Washington between Whidbey Island and the coastline of Snohomish County approximately between the cities of Everett and Mukilteo. Possession Sound connects the main Puget Sound basin to the south with Saratoga Passage and Port Susan to the north. The Snohomish River flows into Possession Sound at Port Gardner Bay. Gedney Island, also called Hat Island, is located in Possession Sound.

Possession Sound was named by George Vancouver. On June 3, 1792, Vancouver landed near the present site of Everett and celebrated the birthday of George III by holding a ceremony claiming possession of the land of "New Georgia" for Britain. Due to his circumnavigation of the world, Vancouver's dates are off by one. June 3 was, by his reckoning, June 4, the king's birthday. His possession ceremony also involved the naming of Possession Sound, Port Gardner, Port Susan, and the Gulf of Georgia.

The Mukilteo to Clinton run of the Washington State Ferries, part of Washington State Route 525, crosses the narrow part of Possession Sound.

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