This trek is most popular and fascinating trek in Nepal. The Tourism of Nepal gave permission to trekkers in 1991 under stick control on obtaining a special permit for this region. The strictness is enforce to protect the tradition and as well as the environment of this region. So limited number of tourists are allowed to visit this area. Therefore Mustang area is able to protect its own typical Tibetan culture. The main attraction of this trek is Lo-Manthang and the people of Lo-Mangthang are known as "Lobes".