Included here are the Himalayas which in biogeographic terms can be divided into the western and eastern Himalayas. The western zone includes the area westward of the Kali Gandaki River Gorge (the world’s deepest valley) in Central Nepal which acts as a biogeographic barrier between the Eastern and Western Himalayan. Also included are the southern slopes and offspurs of the Western Himalayas, the valleys of the rivers Gilgat, Kabul, Kunar, Kurram and Swat, and with mountains like Everest, Dhaulagiri and Makalu, this zone has the tallest peaks on Earth. The eastern Himalayas includes eastern Nepal, Darjeeling, Sikkim, Bhutan, a large part of the Assam Himalayas and the extreme southeastern part of Tibet.

Western Himalayan Riparian Communities

Along streams and watercourses species of Aletris, Caltha, Pedicularis, Polygonum, Potentilla and Ranunculus are likely to be seen. Endemic species that rely on these wetter areas include Hedysarum microcalyx (Fabaceae) and Oxytropis williamsii (Fabaceae).


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