Mustang was only opened to the trekkers in 1991. The department of immigration issued only a small number of special permits. To protect the local Tibetan traditions from outside influence as well as protect the environment. Mustang is situated in the transhimalayan region of Nepal.

The district of Mustang is where the Nepalese mountains yield to the southern Tibetan plateau. As the Transition Zone between these two extreme environments, Mustang offers the visitor a unique ecology and geology. Mustang caves, forts, monasteries and temples, which date to past millennia, carry echoes of the areas rich history and the friendly people are testament. Mustang's natural and cultural treasures have made it one of the most popular tourist and trekking destination of Nepal