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] Indian Ocean. The Tsanpo has a still longer course of 800 miles eastwards before it too bends southwards to flow through Assam into the Bay of Bengal. Between the points where these two giant rivers change their direction there extends for a distance of 1500 miles the

Fig. 2. Orographical Map.

vast congeries of mountain ranges known collectively as the "Himalaya" or "Abode of Snow." As a matter of convenience the name is sometimes confined to the mountains east of the Indus, but geologically the hills of Buner and Swat to the north of Peshawar probably belong to the same system. In Sanskrit literature the