Established from Hot Springs Reservation, Hot Springs National Park is a United States National Park in central Arkansas adjacent to the city of Hot Springs. Hot Springs Reservation was initially created by an act of the United States Congress on April 20, 1832, and the area was made a national park on March 4, 1921. It is the smallest national park by area in the United States. Since Hot Springs National Park is the oldest federal reserve, it was the first to receive its own US quarter in April 2010 as part of the America the Beautiful Quarters series.
The hot springs flow from the western slope of Hot Springs Mountain, part of the Ouachita Mountain range. In the park, the hot springs have not been preserved in their unaltered state as natural surface phenomena. They have instead been managed to conserve the production of uncontaminated hot water for public use.