Another major attraction of the Annapurna region is Upper Mustang. Also known as the Forbidden Kingdom, Upper Mustang gives you the opportunity to know about the Tibetan-Buddhist heritage and history of the region. Monasteries in Thinggar, Namgyal, Niphu, and Garphu along with the mysterious sky caves add more mystery and allure to Upper Mustang. Annapurna region also hosts Tilicho Lake which is considered the highest-altitude freshwater lake in the world. Annapurna Circuit Trek, Ghorepani Poonhill Trek, Annapurna Base Camp Trek, and Upper Mustang Trek are a few of the famous treks in this region. From the world's deepest gorge, Kaligandaki Gorge to the largest rhododendron forest to the world’s highest altitude glacial Tilicho Lake, this region has it all.