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.