Bombay Hook protects one of the largest remaining expanses of tidal salt marsh in the mid-Atlantic region. The refuge, located along the coast of Delaware, is mostly marsh, but also includes freshwater impoundments and upland habitats that are managed for other wildlife. It is primarily a refuge and breeding ground for migrating birds and other wildlife. The refuge, a nationally recognized birding spot attracting birders from across the country, is designated a Globally Important Bird Area.