Mangshi, former name Luxi (潞西), is a county-level city and the seat of Dehong Dai and Jingpo Autonomous Prefecture in western Yunnan province, China. Mangshi has an area of 2,900.91 km2 (1,120.05 sq mi), with an urban area of 18.66 km2 (7.20 sq mi). Han Chinese, Dai people and Jingpo people are the major ethnic groups. Luxi County was established in 1949, and became a county-level city in 1996.