Nepal is rich in cultural, geographical, and natural diversity. Nepal is a paradise for tourist because of her abundant natural beauties, hidden valleys, people’s exclusive cultures and customs. In Nepal some of the places are strictly restricted for visiting and trekking for foreigners and cannot get permit and only option available is to travel with liaison or environmental officer and pay for a special permit and organize with government registered trekking company of Nepal. Even though the government has not listed the restricted area in Nepal, the immigration office states that "trekkers are not allowed to trek in the notified areas previously known as restricted". The main places that are restricted for trekking for foreigners are upper Dolpo, Manaslu, Kanchenjunga, the route to Nangpa La in Khumbu, upper mustang, Rolwaling Makalu etc. and if you try to enter these places police will return you back. The reasons are: these places are the sensitive border area with China, to avoid environmental degradation and outside influence in culture, and trekking in these regions is dangerous and government cannot provide security needed to the trekkers. However government of Nepal has opened some of the restricted area for trekking. Restricted area trekking offers you the different experience of nature and culture as these areas are untraded by the tourists.
Upper Mustang Tea House Trek that was opened in 1992 is the strict trekking area of Nepal