The Twin Peaks WSA is located in Lassen County, California (7,079 acres) and in Washoe County, Nevada (83,712 acres). The WSA contains 90,791 acres of BLM-administered land and surrounds 1,257 acres of private land that is located in 12 parcels, varying in size from 40 to 320 acres. The WSA contains steep canyons, numerous peaks and ridges, many small springs, and two perennial streams. Plant life is a mixture of big and low sage, grasses, and sparsely scattered junipers. Elevations range from 3,900 feet on the eastern side of the WSA, along the edge of the Smoke Creek Desert, to 6,572 feet atop Twin Peaks, which is located in the south central portion of the WSA.