Dagu Valley

29°13′36″N 92°20′27″E / 29.226589°N 92.340906°E / 29.226589; 92.340906 Dagu Valley (Chinese: 达古峡谷; Tibetan: སྟག་ཀུ་རི་ཐང་), located in Sangri County, Shannan, Tibet, China, is a high-altitude valley within the eastern Tibetan Plateau. Spanning approximately 30 kilometers, it ranges from 2,000 to 4,200 meters above sea level, featuring dramatic cliffs, glacial meltwater streams, and dense forests.

The valley is ecologically significant for its vertical biodiversity: lower slopes host mixed coniferous forests dominated by fir and spruce, while alpine meadows above 3,500 meters bloom with rare flora like Rhododendron phaeochrysum and Saussurea medusa during summer. It serves as a critical habitat for endangered species such as the snow leopard (Panthera uncia) and Chinese goral (Naemorhedus griseus).

Culturally, Dagu Valley is intertwined with Tibetan heritage. Local communities, primarily of Amdo Tibetan descent, maintain traditional practices like yak herding and barley cultivation. The Valley is dotted with sacred sites, including ancient prayer flags and mani stones engraved with Buddhist mantras. A notable landmark is the 13th-century Dagu Monastery, a Gelugpa sect institution that hosts annual rituals such as the Cham Dance Festival. The area also preserves remnants of the Tea Horse Road, highlighting its historical role in trade between Sichuan and Tibet.