Backcountry Press, 2021. Trade Paperback. The Klamath Mountains are a fascinating and botanically diverse area situated at the the crossroads of the Coast Range, Modoc Plateau, Sacramento Valley, Cascade Range, and Sierra Nevada the Klamath Mountains and hold representative species from each. Combine that with their attendant geology, topography, and climate, and the floristic diversity is second to none for a temperate region.