The Home Ministry of Nepal opened the Upper Mustang region for trekkers in October 1991. The region of the Kaligandaki, from the Tibetan border south to Kagbeni, is generally referred to as ?Upper Mustang?. It is a rare privilege to trek in Upper Mustang. In many ways, a trek into Upper Mustang is similar to trekking in Tibet. The way of life of true mountain people can be experienced here cut off for years from the rest of Nepal. So, it is also called the district across the Himalayas. The settlements are scattered with little sign of cultivation between villages. Upper Mustang, being in the Himalayan rain shadow, is one of the few parts of the country that are suitable to trek during the monsoon period even. The Upper Kaligandaki valley is still quite dry with occasional rainfall.