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Birch Bay is a protected bay of the east shore of the Salish Sea, between Semiahmoo Bay and Lummi Bay; approximately 100 miles (160 km) north of Seattle and 35 miles (56 km) south of Vancouver, BC, Canada.
The bay gives its name to a census-designated place (CDP) along the bay's shore in Whatcom County, Washington, United States. The population was 8,413 at the 2010 census, a 69.6% increase over the 2000 census.
Birch Bay was named in 1792 by Archibald Menzies, a member of the Vancouver Expedition. Vancouver's two ships used Birch Bay as an anchorage for several days. Menzies noted a number of species of birch and gave the name to the bay.
Birch Bay is located at 48°55′56″N 122°44′50″W (48.932167, -122.747192).
According to the United States Census Bureau, the CDP has a total area of 21.2 square miles (55.0 km²), of which, 15.8 square miles (40.9 km²) of it is land and 5.4 square miles (14.0 km²) of it (25.45%) is water.
Birch Bay is a headland bay created by the refraction of incoming waves on the headlands that lie on either side of the bay. The headland to the north is Birch Point, and the one to the south is Point Whitehorn. The waves bend as they enter the bay and lose energy in the process. The result is a half-moon-shaped bay with a gentle sloping beach.