Mengzi (Chinese: 蒙自; pinyin: Méngzì) is a city in the southeast of Yunnan Province, China. Administratively, it is a county-level city and the seat of the Honghe Hani and Yi Autonomous Prefecture, located about 175 kilometres (109 mi) south-southeast of the provincial capital of Kunming. It is situated in the centre of a fertile valley basin on a plateau 1,310 metres (4,300 ft) above sea level and was home to 417,156 inhabitants as of 2010 census.