Marble Mountain Wilderness is a 241,744-acre protected area in California’s Klamath National Forest, shaped by the rugged Salmon Mountains, deep canyons, high ridges, and strikingly varied geology. First established in 1931 as the Marble Mountain Primitive Area and designated federal wilderness in 1964, it became part of the national wilderness preservation system. Its limestone, metamorphic rock, caves, rivers, lakes, and extensive elevation range create an unusual concentration of habitats within a compact mountain region. The wilderness is known for rare plants, isolated conifer stands, diverse fish and wildlife, and features such as Bigfoot Cave, Wild and Scenic rivers, and a stretch of the Pacific Crest Trail.