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Decatur Island

Island of the San Juan Islands in northwest Washington, United States

Decatur Island is one of the San Juan Islands in Washington state, USA. Located just east of Lopez Island across Lopez Sound and just south of Blakely Island across Thatcher Pass, it is 3.524 square miles (9.127 km²) in area, and was named by the Wilkes Expedition in 1841 for naval officer Stephen Decatur.

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