Maury Island Campground

Patos Island is the northernmost island of the San Juan Islands of the U.S. state of Washington. Since 1893, the small island has been home to the Patos Island Lighthouse, guiding vessels through Boundary Pass between Canada's Gulf Islands and the United States. It is the site of several border markers establishing the Canada–United States border on Haro Strait, following the settlement of disputes between 1859 and 1908. From 1939 to 1978, the island was owned and operated by the United States Coast Guard, with members manning both the lighthouse and the Coast Guard station full-time.

The island and adjacent islets comprise Patos Island Marine State Park, a 207-acre (0.84 km2) marine park with 20,000 feet (6,100 m) of saltwater shoreline. The Washington State Parks and Recreation Commission began operating Patos Island as a state park under a lease agreement with the Bureau of Land Management in 1974. The entire island is owned by the federal government and is administered by the Bureau of Land Management's Wenatchee Office, which calls the island the "northwestern-most point" in the Lower 48. The Washington State Parks and Recreation Commission operates a small campground facility at Active Cove near the west side of the island, maintains a 1.5-mile (2.4 km) loop trail, and has two offshore mooring buoys.