This map details the Mammoth Lakes region of California, focusing on the Mono Divide and surrounding National Forests and Wilderness Areas. It provides comprehensive coverage of trails, roads, and points of interest within Devils Postpile National Monument, Ansel Adams Wilderness, Dinkey Lakes Wilderness, and the John Muir Wilderness, including segments of the Pacific Crest Trail and John Muir Trail, as well as the Eastern Sierra Scenic Byway.

As a Trails Illustrated map produced by the National Geographic Society, this cartographic product is designed for outdoor enthusiasts and travelers. The detailed topographic information and specific trail and road designations suggest a focus on practical navigation for hikers, backpackers, and motorists exploring the Mammoth Lakes region and its extensive wilderness areas. The map's utility lies in its comprehensive depiction of recreational routes and natural landmarks within national forests and monuments.