The Iron Mountain); and farther west, Ullugh-muz-tagh.
By the mountains Khan-tengri, Muz-art, Terskei, Eshik-bashi and Narat.
Muz-art on the north-east shoulder of Khan-tengri) climb up to 8000 to 12,000 ft.
From it three routes start for West Turkestan; the one principally used climbs over the Bedel pass (13,000 ft.) in the Kokshal-tau and makes a detour round the east and along the north side of the Issyk-kul, while the others cross over the Muz-art pass (12,000 ft.), on the northeast shoulder of Khan-tengri, and the Terek pass (12,730 ft.) respectively, the latter into Ferghana.
In the Terskei Alatau; and the Tez at 11,800 and the Akbel at 12,000 ft., both in the Sary-jas; while the pass of Muz-art, on the east shoulder of the Khan-tengri, necessitates a climb of 12,000 ft.
This valley, which runs up at its eastern end to the Muz-tagh-tau, is about 75 m.
After traversing the desert of Gobi from Sa-chou to Hami, the great northern route crossed over into the Dzungarian valley either by the Otun-koza depression or by the gap at Urumchi, or else it proceeded over the Muz-art pass on the east side of Khan-tengri or over the Bedel pass in the Kokshal-tau and so down into the valley of Kulja.