Upper Mustang Trek is an upper Mustang tour and holiday package to explore the hidden kingdom of Lo Manthang. Mustang is the hidden kingdom of the world. On top of the Kaligandaki River, Mustang lies in the north of the Annapurna region, bordering Kagbeni village. The last point of the Upper Mustang trek reaches Lo-Mangthang, a walled city of whitewashed mud bricks with wonderful Buddhist prayer wheels and stupas. Mustang preserves one of the last undisturbed Tibetan cultures in the world.