The Dzungarian Ala-tau Mountains, which separate it from Kulja, extend south-west towards the river Ili, with an average height of 6000 ft.
He crossed, and named, the Dzungarian extension of the Gobi desert, and then traversed the Gobi itself from Hami to Sachu, which became a point of junction between his journeys and those of Krishna.
Geographically, Mongolia may thus be said to occupy both terraces of the great plateau of east Asia, which stretches in the south of Siberia, between the Sailughem range of the Great Altai and the Great Khingan - with the exception of the Dzungarian depression.
But while its southern foot stands in the Dzungarian trench, i.e.
Thus the Ektagh Altai is a true border-rangethat is, a lofty and steep escarpment facing the Dzungarian depression, with a gentle and relatively short slope towards the plateau.