High Quality Content by WIKIPEDIA articles! The Marble Mountain Wilderness is a 241,744-acre (978.30 km2)wilderness area located 60 miles (97 km) northeast of Eureka, California, USA. It is managed by the US Forest Service and is within the Klamath National Forest. The land was first set aside on April 1931 as the Marble Mountain Primitive Area (234,957 acres (950.84 km2)), it was one of four areas to gain primitive status under the Forest Service`s L-20 regulations that year. In 1964, it became a federally designated wilderness area when the US Congress passed the Wilderness Act.