Definition of "Qinghai"

Tibetan is found predominantly in Tibet; Tibetan-speaking communities are also found in Sichuan, Qinghai, Yunnan, and Gansu. In Tibet, all official documents are issued in both Tibetan and Chinese, and also in certain regions of Sichuan and Qinghai. Moreover, the radio stations in Tibet broadcast in Tibetan and Putonghua. Similarly, the Chengdu radio station in Sichuan and the Xining radio station in Qinghai also have regular Tibetan broadcasts.

1975, “The National Minority Languages of China”, in Winfred P. Lehmann, editor, Language and Linguistics in the People's Republic of China‎, University of Texas Press, page 119

The source of the Yellow River is in the Qinghai Province on the Tibetan Plateau. This area is often called the "Roof of the World" because of its high altitude, the height of a place above sea level.

2001, Kim Dramer, “China's Sorrow”, in The Yellow River‎ (Juvenile Literature), Franklin Watts, pages 7–8

The decaying clusters of workshops, bunkers and dormitories are remnants of Plant 221, also known as China’s Los Alamos. Here, on a mountain-high grassland called Jinyintan in Qinghai Province, thousands of Tibetan and Mongolian herders were expelled to create a secret town where a nuclear arsenal was built to defend Mao Zedong’s revolution.

2018 January 20, Chris Buckley, Adam Wu, “Where China Built Its Bomb, Dark Memories Haunt the Ruins”, in The New York Times‎, archived from the original on 20 January 2018, Asia Pacific‎