Long Pond is a 1,721-acre (7.0 km2) lake within the towns of Lakeville and Freetown, in southeastern Massachusetts. It shares its waters with Assawompset Pond. These lakes provide a source of drinking water to the city of New Bedford, the largest city in southeastern Massachusetts. Long Pond is roughly one mile (1.6 km) wide by four miles (6.4 km) miles long, and contains three islands within its boundaries. In 1894 Assawompset Pond was dammed, increasing the water depth of Long Pond (which is connected by a small river) by about five feet (1.5 m). This created Nelson Island and caused Sunken Island to disappear due to erosion. All that remains of Sunken Island are the rocks in a shallow area just to the northwest of Lewis Island. Lewis Island is the largest of the three remaining islands