Jiuzhaigou is a nature reserve and national park located in the north of Sichuan province, China. Jiuzhaigou Valley is part of the Min Mountains on the edge of the Tibetan Plateau and stretches over 72,000 hectares (180,000 acres). It is known for its many multi-level waterfalls, colorful lakes, and snow-capped peaks. Its elevation ranges from 2,000 to 4,500 metres (6,600 to 14,800 ft). Jiuzhaigou Valley was inscribed by UNESCO as a World Heritage Site in 1992 and a World Biosphere Reserve in 1997. It belongs to the category V (Protected Landscape) in the IUCN system of protected area categorization.