Upper Mustang is an isolated and desert-like region that lies north of Annapurna region. The landscape of Mustang is unique having naturally carved sandstone pillars and discontinuous moraine terraces made of a variety of color -red, yellow and brown together. It is comparatively considered to be one of the easy trekking routes up to Lo Manthang. The trekking route passes through an almost treeless landscape and infertile areas. You will feel a strong wind blowing during the day time. In addition, experiencing the culture, religion, and lifestyle of the Mananghis is another social aspect highly noticeable. The medieval wall city of Lo Monthang, un-official capital of Mustang still remains a kingdom. The history of Lo Manthang is based on myth and legend rather than the recorded detail. Mustang maintained its status as a separate principality until 1951. Trekking to Upper Mustang was officially opened in 1992 with a special permit. Only a limited number of trekkers is allowed to explore this remote region each year. Nepal government wants to protect and conserve the local Tibetan culture and tradition and the fragile environment of the Upper Mustang region. Upper Mustang trekking is one of the best treks one can do even in the monsoon season. As it lies in the rain shadow area, north of Annapurna and Dhaulagiri ranges, completely well- sheltered from the monsoon. We take flights for both ways Pokhara- Jomsom – Pokhara to avoid the lower rainy section hike in Annapurna region. The best advantage of doing this cultural trek in monsoon season is that the village is full of local people busy at their every day works. Furthermore, the whole region is in bloom which makes really a fabulous contrast with the wind eroded hills, red cliffs and snow-capped mountains in the natural setting – a great vista. Thus, the upper Mustang trek would be once in a lifetime experience for those who want to explore the fascinating medieval town of Lo Manthang and the ancient caves.