Round Pond is located in Ridgefield, Connecticut, USA (41°18′13″N73°32′12″W). Formed by a receding glacier, it is almost circular, and is 32 acres (130,000 m²) in size. The pond drains across the state boundary to the state of New York into the Cross River Reservoir, providing an initial flow to New York City. Once used as a reservoir for city water for Ridgefield, the spring-fed aqueduct is no longer used for that purpose. The pond gets an average of 4.44 inches of precipitation per month, and is at an elevation of 797 feet (243 m) above sea level.