ABSTRACT
The great Himalayan range, the high Karakoram range and the Hindu Kush meet in the trans-Himalayan region and form a strategic triangle. Northern frontiers of British India rested on the high Karakoram range which formed the watershed between the Tarim Basin (in Xinjiang) and the Indus river system draining into the Indian Ocean. In the west, the frontier merged into the Pamirs and Hindu Kush mountain systems. In the east, the mountain frontiers ran into the high plateau of Tibet, which is bounded by Kun Lun in the north and the great Himalayan range in the south. The narrow wedge of the Wakhan corridor lies on the southern slope of the Pamir.
