Tsum Valley Trek: 17 Days outfitterhimalaya.com Nar Phu Valley Trek: 17 Days Explore a remote part of the western Himalayas in Nepal & learn about Tibetan Buddhism on our Nar Phu valley trek 17 days. Follow a less crowded trail packed with jaw-dropping mountain panoramas and come across exotic flora & fauna on this adventurous off-beat trek with two high passes, The Kang La & Thorong La Pass.