Passage: In the north of the region is the Sailughem Mountains, also known as Kolyvan Altai, which stretch northeast from 49° N and 86° E towards the western extremity of the Sayan Mountains in 51° 60 N and 89° E. Their mean elevation is 1,500 to 1,750 m. The snow-line runs at 2,000 m on the northern side and at 2,400 m on the southern, and above it the rugged peaks tower some 1,000 m higher. Mountain passes across the range are few and difficult, the chief being the Ulan-daban at 2,827 m (2,879 m according to Kozlov), and the Chapchan-daban, at 3,217 m, in the south and north respectively. On the east and southeast this range is flanked by the great plateau of Mongolia, the transition being effected gradually by means of several minor plateaus, such as Ukok plateau (2,380 m) with Pazyryk Valley, Chuya (1,830 m), Kendykty (2,500 m), Kak plateau (2,520 m), (2,590 m), and (2,410 m).
By how many meters does the mean elevation of the Kolyvan Altai vary? How many meters does the snow-line vary from the northern to the southern side? How many meters higher is Kendykty than Pazyryk Valley, Chuya? How many meters higher is Kendykty than the Ukok plateau? How many meters higher is the Chapchan-daban pass than the Ulan-daban? How many meters higher is the Chapchan-daban than Kendykty? How many meters higher is the snow line on the southern side than the northern side? Of the surrounding 6 plateaus, how many have a height at or above 2500m? Of the surrounding 6 plateaus, how many have heights above 2000m? Which mountain pass is at a higher elevation: Ulan-daban or Chapchan-daban? Which of the surrounding plateaus have a height at or above 2500m? Which plateau has the lowest elevation of Ukok, Chuya, and Kak?