Amdo ཨ༌མདོ་
The Amdo region is home to over 1.6 million Tibetans, or roughly 30% of the Tibetan population, and covers an area slightly smaller than France (these figures include the Gyarong Tibetan areas as well). Amdo Tibetans are found in 6 Tibetan autonomous prefectures in Qinghai, 1 prefecture in Sichuan, 1 prefecture in Gansu and one small autonomous county in Gansu. If you think of Tibet as rolling grasslands filled with yaks and nomadic herders on horseback, then Amdo is probably the area you are thinking of. The picture above is of the grasslands of Ngawa Prefecture རྔ་བ་ཁུལ་ in northern Sichuan.