Mount Trumbull Wilderness is a seven thousand eight hundred eighty-acre protected area on Arizona’s remote Arizona Strip, centered on an eight thousand twenty-eight-foot mesa-like mountain on the Uinkaret Plateau. Named by John Wesley Powell for Senator Lyman Trumbull, it links this isolated landscape to western exploration and mapping. Its vegetation shifts from juniper, pinyon, yucca, and sagebrush on lower slopes to ponderosa pine higher up, including some old-growth survivors despite heavy late nineteenth-century logging. The area is also important for volcanic geology, with basalt flows, a later cinder cone, and a wider volcanic field whose lava once dammed the Colorado River. Ancestral Puebloans lived here, and later Mormon settlers cut timber for Saint George.