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Peace Arch Park is an international park consisting of Peace Arch Historical State Park in Washington, United States and Peace Arch Provincial Park in British Columbia, Canada. The park straddles the international boundary between the two countries at the extreme western end of the main contiguous section of the two countries' land border, between Blaine, Washington, United States, and Surrey, British Columbia, Canada, where it reaches Semiahmoo Bay of the Salish Sea on the continent's Pacific Coast. The park's central feature is the Peace Arch (French: Arche de la Paix). Construction of the 20.5-meter-tall (67 ft) arch was headed by American lawyer Sam Hill and dedicated in September 1921. The Peace Arch commemorates the signing of the Treaty of Ghent in 1814 and symbolizes a long history of peace between the two nations. The monument is built on the exact U.S.-Canada boundary, where Interstate 5 on the U.S. side of the border becomes Highway 99 on the Canadian side, in the grass median between the northbound and southbound lanes. The park is located at the Peace Arch Border Crossing (also known as the Blaine-Douglas Border Crossing), where Highway 99 in British Columbia and Interstate 5 in Washington State meet. It is one of the busiest border crossings between Canada and the United States, and the busiest such crossing west of Detroit. The park's northern portion is about 9 hectares (22 acres) and is managed by the British Columbia Ministry of Environment.