Ash Meadows National Wildlife Refuge features approximately 23,000 acres (93 km²) of spring-fed wetlands and is managed by the United States Fish and Wildlife Service. The refuge provides habitat for at least 24 plants and animals found nowhere else in the world. Four fish (Devil's Hole Pupfish, Amargosa Pupfish, Warm Springs Pupfish, and Ash Meadows Speckled Dace), one insect (Ash Meadows Naucorid), and one plant (Amargosa Niterwort) are currently listed as endangered species. Ash Meadows NWR can be accessed via SR 373 in Amargosa Valley, SR 160 near Crystal, Nevada or from Bell Vista Road west of Pahrump. Entrances to the refuge are marked with road signs.