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Calais, city, Washington county, eastern Maine, U.S., on the St. Croix River (there spanned by an international bridge to St. Stephen, New Brunswick, Canada), 98 miles (158 km) east-northeast of Bangor. The river is noted for its tidal surges, which can vary by 28 feet (9 metres). Settlers were attracted to the area in 1779 by the abundance of natural resources. The community developed as a lumbering centre; after 1801 shipbuilding was the most important...