Somersworth topographic map
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About this map
According to the United States Census Bureau, the city has a total area of 10.0 square miles (25.9 km2), of which 9.8 square miles (25.4 km2) are land and 0.2 square miles (0.5 km2) are water, comprising 1.96% of the city. Somersworth is bordered to the northeast by the Salmon Falls River, which is also the state boundary with Maine. The highest point in Somersworth is Prospect Hill rising just west of the city center, on which the city reservoir is built. The hill's elevation is approximately 310 feet (94 m) above sea level.
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