Tengchong is a county-level city of Baoshan City, western Yunnan province, People's Republic of China. It is well known for its volcanic activity. The city is named after the town of Tengchong which serves as its political center, previously known as Tengyue in Chinese. English language sources of the late nineteenth and early twentieth centuries use names such as Tingyueh, Teng Yueh, Momein, and Momien, these last two from the name for the place, one of the former Chinese Shan States, in the Shan language.