Robin Boustead, Pema Tsiring Sherpa, Lakpa Sherpa and Karma Sherpa have claimed to have hiked a trail that links each himal from Kanchenjunga to Api. The upper route passes from East to West through established trekking areas of Kanchenjunga to Makalu Barun, Solukhumbu, Rolwaling Himal, Helambu, Langtang, Ganesh Himal, Manaslu, Annapurna, Dolpa, Rara Lake and Humla finishing on the Tibetan border at Hilsa.