Amdo is one of the Three Realms of Tibet Traditionally. It takes up a large area from the Machu River (Yellow River) to the Drichu river (Yangtze River). Amdo is composed of Qinghai, South of Gansu, and North of Sichuan. We’ll go from; Qilian mountain to the north separate Gebi desert from Tibetan plateau then Chang-tang plateau to the west connects to the central Tibet. In the south, Kham, another part of the east Tibet is closely linked to Amdo. The major area of this vast land is called Qinhai Province today.
Today, The Chinese is a majority of the population in the eastern part of Qinghai and the provincial capital, Xining. The northern part of Qinghai has a Mongol majority. The Tibetan of Amdo are referred to as “Amdopa” as a regional distinction from Tibetans of Khampa and Central Tibetan, mainly located in the western and southern parts of Qinhai, which are now administered as various Tibetan, Tibetan-Qiang, or Mongol-Tibetan autonomous prefectures.
Due to the geographical isolation of many tribal groups, it naturally formed different dialects of the Tibetan language. However, the written Tibetan language is the same throughout the Tibetan area.