Gejiu 个旧市
![](/Images/godic/202501/15/Gejiu5832.JPG")
![View of Gejiu and its lake at night](/Images/godic/202501/15/Gejiu-and-lake-at-night5832.jpg")
![Light-blue botryoidal Hemimorphite outined by darker-blue Veszelyite, Laochang ore field,[1] Gejiu County.](/Images/godic/202501/15/Hemimorphite-Veszelyite-2331775832.jpg")
Gejiu (个旧; Hani: Goqjef; Wade-Giles: Ko-Chiu; formerly known as Kotchiu) is a county-level city and the former capital of Honghe prefecture, Yunnan Province, China, and has 136,000 inhabitants (ranked 5th largest city in Yunnan). It is the site of the country's largest tin deposits and its main industry is mining.