The Altai Mountains (ɑːlˈtaɪ), also spelled Altay Mountains, are a mountain range in Central and East Asia, where Russia, China, Mongolia and Kazakhstan converge, and where the rivers Irtysh and Ob have their headwaters. The massif merges with the Sayan Mountains in the northeast, and gradually becomes lower in the southeast, where it merges into the high plateau of the Gobi Desert. It spans from about 45° to 52° N and from about 84° to 99° E.
The region is inhabited by a sparse but ethnically diverse population, including Russians, Kazakhs, Altais, Mongols and Volga Germans, though predominantly represented by indigenous ethnic minorities of semi-nomadic stock. The local economy is based on bovine, sheep, horse husbandry, hunting, agriculture, forestry, and mining. The Altaic language family takes its name from this mountain range.
Altai is derived from underlying form *altañ "gold, golden" (compare Old Turkic 𐰞𐱃𐰆𐰣 altun "gold, golden") with coda -ñ underlying the -n & -y correspondence among cognates in different Turkic languages & dialects (e.g. qōñ ~ qoy "sheep", Qitan ~ Qitay "Khitans", etc.), as well as in Mongolian.
The mountains are called Altain nuruu (Алтайн нуруу) in Khalkha Mongolian, altai-yin niruɣu in Chakhar Mongolian, and Altay tuular (Алтай туулар) in the Altay language. They are also called Алтай таулары or التاي تاۋلارى in Kazakh; Altajskije gory (Алтайские горы) in Russian; Altay Taghliri ( or Алтай Тағлири) in Uyghur; ā'ěrtài shānmài in Chinese (阿尔泰山脉 simplified, 阿爾泰山脈 traditional, or اَعَرتَىْ شًامَىْ in Xiao'erjing); and Arteː shanmeː (Артэ Шанмэ) in Dungan.
The Altai Mountains are a system of remote mountains in central Asia that cover an area . The mountains stretch for from northwest to southeast.
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.