Lake Ilo National Wildlife Refuge (NWR) is located in the U.S. state of North Dakota and is managed from Audubon National Wildlife Refuge by the U.S. Fish and Wildlife Service. The refuge consists of Lake Ilo, surrounding wetlands and some upland range, providing habitat for hundreds of species of birds, and numerous fish and mammal species. An average of over 16 inches (40 cm) of precipitation falls annually, supporting a prairie ecosystem.[1]