The Chincoteague National Wildlife Refuge is a 14,000-acre wildlife preserve operated by the U.S. Fish& Wildlife Service. It is primarily located on the Virginia half of Assateague Island with portions located on the Maryland side of the island, as well as Morris Island and Wildcat Marsh. Mostly composed of beach, dunes, marsh, and maritime forest, the refuge contains a large variety of wildlife, including the Chincoteague pony.