The Great Himalaya Trail is a route across the Himalayas from east to west. The original concept was to establish a single long distance trekking trail from the east end to the west end of Nepal that includes a total of roughly 1,700 kilometres (1,100 mi) of path. There is a proposed trail of more than 4,500 kilometres (2,800 mi) stretching the length of the Greater Himalaya range from Nanga Parbat in Pakistan to Namche Barwa in Tibet thus passing through, India, Nepal, Bhutan and Tibet. Although an actual continuous route is currently only a concept, if completed it would be the longest and highest alpine hiking track in the world.

In November 2014, cross-country hikes of Nepal and Bhutan sections have been undertaken by a well-funded international non-governmental organization. It visits some of the most remote communities on earth, passing through the diverse landscapes including valleys and plateaus. Nepal's GHT has 10 sections comprising a network of upper and lower routes. The GHT (so-called upper and lower) can be roughly mapped out through existing routes, but these routes may not provide a continuous and uninterrupted trail.