Tengchong County is a county of Baoshan City, western Yunnan province, Southwest China. It is well known for its volcanic activity. The name has also been given in English language sources of the late nineteenth and early twentieth centuries as Tingyueh, Teng Yueh and Momein.It borders with Burma in the northwest for 151 kilometres (94 mi). By road, it is 650 kilometres (400 mi) west of the provincial capital, Kunming, and 170 kilometres (110 mi) westward from Baoshan's urban area.