Mustang is one of the districts of Nepal, and the entire district is within the Annapurna Conservation Area, which happens to be the largest protected area of Nepal. Jomsom is the headquarter of Mustang, and it is spread in the area of 3,573 km square. Annapurna Conservation Area Project (ACAP) is primarily overseen by Development programs and tourism management.
So, for the trekking purpose in the Upper Mustang region, you need a permit from Annapurna Conservation Area Project (ACAP), Trekkers Information Management System (TIMS) and Special Permit for Upper Mustang issued from Department of Immigration, Kathmandu, Nepal. COME to visit. there is good vibes too.