Spiti is nestled in the Trans-Himalayan belt, forming a classic high-altitude cold desert. The landscape is primarily defined by the Spiti River, which originates from the Kunzum Range and flows southeast to merge with the Sutlej River. The valley is flanked by towering mountain ranges that act as a rain shadow, blocking the moisture-laden monsoon winds from the south, resulting in a distinctly arid environment.
The physical geography is stark and majestic, characterized by loose, crumbly mountains, deep river gorges, and massive scree slopes. Vegetation is extremely sparse, confined mostly to patches of green along river banks and in villages where snowmelt is channeled through ancient irrigation canals (kuhls).
Natural resources are limited, but the region is geologically rich. The Pin Valley, a tributary valley of the Spiti, is famous for its fossils, providing evidence that the Himalayas were once under the ancient Tethys Sea. The region is also home to specialized flora and fauna, including the elusive snow leopard, Himalayan wolf, ibex, and blue sheep.
