Photograph by Cory Richards
Climbers and scientists follow a trail above the Kali Gandaki River in Nepal’s remote Mustang region. More than 60 feet above are rows of unexplored man-made caves dug centuries ago. There may be thousands in the region.
The Kali Gandaki or Gandaki River (also known as the Narayani in southern Nepal and the Gandak in India) is one of the major rivers of Nepal and a left bank tributary of the Ganges in India. It is also called Krishna Gandaki in Nepal.In Nepal the river is notable for its deep gorge through the Himalayas and its enormous hydroelectric potential. It has a total catchment area of 46,300 square kilometers, most of it in Nepal. The basin also contains 3 of the world’s 14 highest mountains over 8,000m, the three being Dhaulagiri I, Manaslu and Annapurna I. Dhaulagiri I is the highest point of the Gandaki basin. It lies between the similar Kosi system to the east and the Karnali (Ghaghara) system to the west.
Source : nationalgeographic.com , wikipedia.org