The Trans Himalayas Mountain Region or Tibetan Himalayan Region is located to the north of the Great Himalayas which consists of Karakoram, Ladakh, Zanskar and Kailash mountain ranges. The countries lies in Trans Himalayan region are Nepal, Bhutan; China occupied Tibet and China itself. Indian states and union territories like Kashmir, Ladakh, Himachal Pradesh, Arunachal Pradesh, Assam, Mizoram, Sikkim, and Darjeeling (West Bengal) are the part of this region. This mysterious region always attracted saints and ascetics of various cults. How and when Buddhism spread in this region where human survival is very tough and challenging, how Buddhism attracted the barbaric community of this region, are the interesting topics discussed in this volume.