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() is a town in eastern Box Elder County, Utah, United States. The population was 791 at the 2000 census. Mantua was settled in the late 1800s when LDS President Lorenzo Snow sent Peter Frederic Peterson and four other families to settle the valley and grow flax. Snow was from Mantua, Ohio, and the town was named after the eastern community in his honor.
According to the United States Census Bureau, the town has a total area of 5.6 square miles (14.5 km²), of which, 4.9 square miles (12.6 km²) of it is land and 0.7 square miles (1.9 km²) of it (13.21%) is water.