Hollow Hills is characterized by a large and gentle bajada that slopes east to west toward Silver Lake, a dry lake that lies just outside the Wilderness' southwest boundary. The bajada is interspersed with washes. Low hills in the east crawl toward the Turquoise Mountains, a gentle range with rounded peaks and smooth-sided ridges. Elevations range from about 300 feet near Silver Lake to a central Wilderness summit of 3,122 feet. The area contains plains, hills, and alluvial fans typical of the California desert. Creosote bush, desert holly, and scale-scrub plant communities dominate the vegetation throughout the area, and desert tortoises and Mojave fringe-toed lizards live here in seclusion. There are no designated hiking trails and no dependable sources of water.