Geiju is a county-level city in Honghe Hani and Yi Autonomous Prefecture, Yunnan Province, China, with 202,000 urban inhabitants. It is the site of China's largest tin deposits and its main industry is mining.

Honghe Hani and Yi Autonomous Prefecture is an autonomous prefecture in Southeast-Central Yunnan Province, China, bordering Vietnam's Lào Cai and Lai Châu provinces to the south. Its name is derived from the Hong (Red) River and the two major ethnic minority groups who live there: the Yi and the Hani. Honghe has an area of 32,929 square kilometres (12,714 sq mi) and its seat is Mengzi. The total population is 4.8 million, of which 61.3% belong to ethnic minorities.