 Indian River Bay is unique among Delaware's inland bays in that it is a drowned river valley, whereas Delaware's other bays are estuaries built on sand bars.Boating, fishing, shellfishing, and crabbing are among the most common recreational uses of Indian River Bay.In addition, the bay is bordered by several protected environmental areas, including Delaware Seashore State Park, Holts Landing State Park, and the Assawoman Wildlife Area.