Foster Island (Washington)

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See Foster Island (Ontario) for the island in the Canadian province of Ontario.
A wood duck rests on Foster Island

Foster Island is an island in Seattle, Washington, USA's Union Bay. Bisected by State Route 520, it is part of the Washington Park Arboretum. There is a walking trail connecting Foster Island and the adjacent Marsh Island to mainland Seattle via a set of bridges and boardwalks.


Coordinates: 47°38′32.5″N 122°17′29.7″W / 47.642361°N 122.291583°W / 47.642361; -122.291583