The Altai Mountains (also spelled Altay Mountains; Altai: Алтай туулар, Altaj tuular; Mongolian: ᠠᠯᠲᠠᠢᠶᠢᠨ ᠨᠢᠷᠤᠭᠤ , Altai-yin niruɣu (Chakhar), Алтайн нуруу, Altain nurú (Khalkha); Kazakh: Алтай таулары, Altay tawları, التاي تاۋلارى Russian: Алтайские горы, Altayskiye gory; Chinese; 阿尔泰山脉, Ā'ěrtài Shānmài, Xiao'erjing: اَعَرتَىْ شًامَىْ) are a mountain range in Central and East Asia, where Russia, China, Mongolia, and Kazakhstan come together, and are where the rivers Irtysh and Ob have their headwaters.