Bombay Hook National Wildlife Refuge 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.

Bombay Hook was established in 1937 as a link in the chain of refuges extending from Canada to the Gulf of Mexico. It is primarily a refuge and breeding ground for migrating birds and other wildlife. The value and importance of Bombay Hook for migratory bird protection and conservation has increased through the years, primarily due to the management of the refuge and the loss of high quality habitat along the Atlantic Flyway.

Bombay Hook is a Ramsar Wetland of International Importance. Portions are also designated a research natural area. The refuge, a nationally recognized birding spot attracting birders from across the country, is designated a Globally Important Bird Area. The Refuge, as well as the entire State of Delaware, is part of the New England/Mid Atlantic Coast Bird Conservation Region Implementation Plan (BCR 30).