|Prime Hook National Wildlife Refuge|
Great blue heron at Prime Hook NWR
|Location||Sussex County, Delaware, Delaware, United States|
|Area||15.6 sq mi (40 km2)|
|Visitors||Open daily in season|
|Website||Prime Hook National Wildlife Refuge|
Prime Hook National Wildlife Refuge is an inviolate sanctuary expressly for migratory birds, located east of Milton, Delaware, United States. It was established in 1963 on 10,000 acres (40 km2) along the western shore of Delaware Bay. The refuge contains a variety of habitats, including freshwater and salt marshes, woodlands, grasslands, ponds, and forested areas, supporting 267 species of birds and a variety of reptiles, amphibians and mammals.