The Seven Mountain-travel Books, H. W. Tilman, pp. 732, The Mountaineers Books, 2003, ISBN 9780898869606, ... The Chapursan is a fine open valley inhabited by Wakhis from Wakhan. Despite the great elevation of over 10,000 ft., they grow wheat, any surplus being taken by Kirghiz who reach the valley from Wakhan by the Irshad pass (16,060 ft.) ...
