The Ansel Adams Wilderness is a wilderness area in the Sierra Nevada of California, USA. The wilderness spans : 33.9% of which is in the Inyo National Forest, 65.8% is in the Sierra National Forest, and the remaining 0.3% covers nearly all of Devils Postpile National Monument. Yosemite National Park lies to the north and northwest, while the John Muir Wilderness lies to the south.