Jiuzhaigou (; ) is a nature reserve and national park located in the north of Sichuan Province in southwestern China. A long valley running north to south, Jiuzhaigou 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. The Jiuzhaigou valley is part of the Min Mountains on the edge of the Tibetan Plateau and stretches over . It is known for its many multi-level waterfalls, colorful lakes, and snow-capped peaks. Its elevation ranges from . History Jiuzhaigou (literally "Nine Settlement Valley") takes its name from the nine Tibetan settlements along its length. The remote region was inhabited by various Tibetan and Qiang peoples for centuries. Until 1975 this inaccessible area was little known. Extensive logging took place until 1979, when the Chinese government banned such activity and made the area a national park in 1982. An Administration Bureau was established and the site officially opened to tourism in 1984; layout of facilities and regulations were completed in 1987. The site was inscribed by UNESCO as a World Heritage Site in 1992 and a World Biosphere Reserve in 1997. The tourism area is classified as a AAAAA scenic area by the China National Tourism Administration. Since opening, tourist activity has increased every year: from 5,000 in 1984 to 170,000 in 1991, 160,000 in 1995, to 200,000 in 1997, including about 3,000 foreigners. Visitors numbered 1,190,000 in 2002. , the site averages 7,000 visits per day, with a quota of 12,000 being reportedly enforced during high season. The Town of Zhangzha at the exit of the valley and the nearby Songpan County feature an ever-increasing number of hotels, including several luxury five-stars, such as Sheraton. Developments related to mass tourism in the region have caused concerns about the impact on the environment around the park. Population 7 of the 9 Tibetan villages are still populated today. The main agglomerations that are readily accessible to tourists are Heye, Shuzheng and Zechawa along the main paths that cater to tourists, selling various handicrafts, souvenirs and snacks. There is also Rexi in the smaller Zaru Valley and behind Heye village are Jianpan, Panya and Yana villages. Guodu and Hejiao villages are no longer populated. Penbu, Panxing and Yongzhu villages lie along the road that passes through the town of Jiuzhaigou/Zhangza