According to Francis Younghusband, there are actually two passes, the eastern or 'Old' Mustagh Pass (alt. about 5,422 m.) and the so-called 'New' Mustagh Pass, about 16 km (9.9 mi) to the west (altitude variously given as 5,700 and 5,800 m.) The pass is on the watershed between the rivers which flow towards the Tarim Basin and those flowing to the Indian Ocean.[1]
^Younghusband, Francis. The Heart of a Continent: A Narrative of Travels in Manchuria, across the Gobi Desert, through the Himalayas, the Pamirs and Chitral, 1884-94, p. 189. Published: 1897. London. Reprint (2005): Elibron Classics Replica Edition. ISBN1-4212-6551-6 (pbk); ISBN1-4212-6550-8 (hbk).