Menghai County is a county under the jurisdiction of Xishuangbanna Dai Autonomous Prefecture, in the far south of Yunnan, China, bordering Burma's Shan State to the southwest. Meng is as variation of Mueang.

Xishuangbanna, sometimes shortened to Banna, is an autonomous prefecture for Dai people in the extreme south of Yunnan Province, China, bordering both Myanmar and Laos. The prefectural seat is Jinghong, the largest settlement in the area and one that straddles the Mekong, called the "Lancang River" in Chinese.