Death Valley National Park is a National Park located east of the Sierra Nevada in the arid Great Basin of the United States. Death Valley National Monument was declared a U.S. National Monument in 1933, placing the area under federal protection. In 1994, the monument was redesignated a national park, as well as being substantially expanded to include Saline and Eureka valleys. It is the hottest and driest of the national parks in the United States. The second-lowest point in the Western Hemisphere is in Badwater Basin, which is 282 feet (86 m) below sea level. Approximately 95% of the park is designated as wilderness. Its wilderness area covers 4,774 square miles (12,360 km2), making it the largest in the Lower 48 states, and the sixth largest in the United States overall. Death Valley National Park is visited annually by more than 770,000 visitors who come to see its diverse geologic features, desert wildlife, historic sites, scenery, and clear night skies.