San Francisco Bay / El Dorado Counties South Central Sierra / Sierra Counties Central Sierra / Mammoth Mountain / Lassen Counties North Central Sierra / Kern Counties East Sierra / Mono Lake / Mariposa Counties South Sierra / Sierra Nevada / Alpine / /
Sierra Nevada Region The Sierra Nevada Conservancy Region includes more than 25 million acres in all or part of 22 counties and is organized into six Subregions: North Sierra: Modoc, Shasta, Lassen Counties North Central