Qaidam Basin
Northeast of the Tibetan Plateau, the Altun Shan-Qilian Mountains range branches off the Kunlun and creates a parallel mountain range running east–west. In between in northern Qinghai is the Qaidam Basin, with elevations of 2,600–3,000 m and numerous brackish and salt lakes. North of the Qilian is the Hexi Corridor of Gansu, a natural passage between Xinjiang and China Proper that was part of the ancient Silk Road and traversed by modern highway and rail lines to Xinjiang. Further north, the Inner Mongolian Plateau, between 900–1,500 m in elevation, arcs north up the spine of China and becomes the Greater Hinggan Range of Northeast China.