Spiti forms a crucial part of the trans-Himalayan ecological zone, characterized by a fragile but rich cold desert ecosystem.
* **Pin Valley National Park:** A high-altitude national park encompassing the Pin River basin. It is renowned as a primary stronghold for the endangered snow leopard and its prey, the Siberian ibex. The park features striking alpine flora and dramatic, colorful mountain geology. * **Kibber Wildlife Sanctuary:** Located near the village of Kibber, this sanctuary spans over 2,200 square kilometers. It represents a prime habitat for snow leopards, blue sheep (*bharal*), red foxes, and Himalayan wolves.