When the altitudes of the intermont latitudinal valleys are compared, the significance orographically of the Chimen valley and of the Kum-kol valley is strikingly emphasized.
Both are much more deeply excavated than all the other latitudinal valleys that run parallel to them, the Chimen valley being 875 ft.
But though the great morphological features of this latitudinal valley forcibly recall the latitudinal valleys of Tibet, the climatic differences give rise to differences between the basins corresponding to the differences between the mountain-ranges themselves.
The latitudinal valley that intervenes between the Akato-tagh and the next great range on the south, the Chimen-tagh, slopes for the most part eastwards, from 12,500 ft.
The preceding methods apply mainly to the latitudinal co-ordinate.
Nevertheless, owing to the fact that nearly all the longer and more important crossings of Tibet and its northern montane region have been made from north to south, or vice versa, that is, transversely across the ranges, and comparatively few from east to west along the intermont latitudinal valleys, the identifications between ranges in the east and ranges in the west are in more than one instance more or less doubtful.
As a result of the wide latitudinal extent of the country there are also marked local variations to be contrasted.
This we may call the latitudinal co-ordinate.
Spurs from the Caucasus and from the Armenian highlands fill up the broad latitudinal depression between them.
As a rule, the streams flow alternately east and west down the intermont latitudinal valleys, until they break through some transverse glen in the range on the northern side of the valley.