The Hekou Yao Autonomous County is an autonomous county in the southern part of the Yunnan province of China. It is part of the Honghe Hani and Yi Autonomous Prefecture and borders the northern Vietnamese city of Lào Cai.

Yunnan is an inland province in Southwestern China. The province spans approximately 394,000 km2 (152,000 sq mi) and has a population of 48.3 million. The capital of the province is Kunming. The province borders the Chinese provinces of Guizhou, Sichuan, autonomous regions of Guangxi and Tibet, as well as Southeast Asian countries Vietnam, Laos, and Myanmar. Yunnan is China's fourth least developed province based on disposable income per capita in 2014.