Biri Sacred, or Biri Shenshan (; ), is mountain located in Bayi District, Nyingchi City, Tibet Autonomous Region. It is a revered site in Tibetan Bon religion and a national forest park established in 2012.
Known as "Monkey Mountain" in Tibetan folklore, it spans 22,594 hectares with a forest coverage rate of 55.91%, featuring distinct vertical vegetation zones ranging from oak and pine forests at lower elevations to fir forests, bamboo groves, and alpine meadows at higher altitudes. The mountain is home to diverse wildlife, including Tibetan antelope, Bengal tigers, and red pandas, documented in the Nyingchi Natural Ecology Museum within the park, which houses 586 species of plant and animal specimens.
Infrastructure development began in the early 2000s, with wooden boardwalks and viewing platforms constructed to facilitate eco-tourism while minimizing environmental impact. The museum, opened in 2012, serves as an educational hub for regional biodiversity. Traditional Bon practices persist, including the annual Saga Dawa Festival, where pilgrims circumambulate the mountain counterclockwise, and rituals involving stone cairns, prayer flags, and a sacred "cosmic tree" believed to connect heaven and earth.
The mountain is important for the environment because it helps protect Bon heritage. One important way it does this is through stories about the fight between the Bon master Akyung Jeb and the Buddhist Padmasambhava in the eighth century, which made the mountain a cultural and spiritual landmark.