If one has arrived at the Himalaya to hike across high passes and vast tree-covered mountainsides, one will be spoiled for choices in Lahaul and Spiti region of Himachal Pradesh. The old trade route to Ladakh and Tibet may have been tarmacked, but most of this remote and spectacular region is still only accessible on foot. Its trails, though well frequented in high season, are long, hard and high, punctuated by few settlements, so be ready for this unending exploration journey! This is one of the most remote and challenging treks, crossing passes as high as 18,300 ft. We follow ancient trade routes still used by the nomadic herdsmen of Changthang. Spiti has only been opened to foreigners since 1993, Travel with the experts!