Ozark National Scenic Riverways, 80,786 acres (32,707 hectares), along the Current and Jacks Fork rivers, SE Mo.; authorized 1964 as the first national scenic river; est. 1972. Many springs flow into the rivers; Big Springs is one of the largest single-outlet springs in the United States. Many large caves with interesting dripstone formations are found along the rivers. Forests cover about 75% of the riverways. Wildlife and fish are abundant in the area. See National Parks and Monuments, table.