Bogdanovich believe - and with them Sven Hedin is inclined to agree - with the parallel ranges of Kalta-alaghan and Arkatagh, which lie S.
And here at least four principal ranges or groups of ranges admit of being discriminated, namely the Astin-tagh, the Chimen-tagh, the Kalta-alaghan and the Arka-tagh, all belonging to the mountainous country which borders on the north the actual plateau region of Tibet.
Gold is obtained in very small quantities in a few places in the Astin-tagh and the Kalta-alaghan.
The next important range, still going south, is the Kalta-alaghan, Carey's Chimen-tagh Range, Przhevalsky's Columbus Range and the range which is variously designated (e.g.
This last is, however, properly the name of a short secondary range which rises along the middle (ara = middle) of the valley between the Chimen-tagh and the Kalta-alaghan.
In the Kalta-alaghan, which is the culminating range of this part of the Kuen-lun, and is overtopped by towering, snow-clad peaks, the passes climb to considerably higher altitudes, namely, 14,560, 1 4,47 0, 1 4,43 0 and 14,190 ft., while the pass of Avraz-davan ascends to 15,700 ft.
Sven Hedin, whilst agreeing that this may possibly be the true conception, inclines to the view that the Achik-kol Range dies away towards the E., and that the Chimen-tagh and the Kalta-alaghan merge westwards into the border-ranges that lie north of the Muzluk-tagh and the Tokuzdavan.
Tibet, the Kalta-alaghan does not decrease, but it increases in elevation towards the east, where, like the Chimen-tagh, it abuts upon and merges in the ranges that border Tsaidam on the south.
Immediately south of the Kalta-alaghan comes a relatively deep depression, the Kum-kol valley, forming a very well-marked feature in the physical conformation of this region.
The view that meets the eye southwards from the heights of the Kalta-alaghan is the picture of a chaos of mountain chains, ridges, crests, peaks, spurs, detached masses, in fact, montane conformations of every possible description and in every possible arrangement.
But between the Chimen-tagh, the Ara-tagh and the Kalta-alaghan there is comparatively little difference in point of elevation, namely, 730 ft.
The biggest ascent is that from the Kalta-alaghan to the Arka-tagh, namely, nearly 1850 ft.