Arun Valley Trekking: Situated in the Sankhusava District of Nepal, it is the deepest valley in the world because it runs between the two highest mountains; Everest and Makalu. Views of Mount Everest, Mt. Makalu, Mt.Baruntse, Mt.Lhotse, Mt.Nuptse ,Mt. Amadablam, Mt.Thamserku etc.Home to more than 650 species of birds and over 800 species of butterflies, shelter of the rare and endangered Panda. Orchids and other flowers along a faint jungle trail, swirl prayer flags at Shipton La. A moderate two week trek.