瑞丽江，又名龙川江或陇川江，发源于中华人民共和国云南保山腾冲县明光乡大汗坝（非龙陵县大汉坝）的一条河川，流经腾冲、陇川及梁河等县，经畹町及瑞丽流入缅甸，在缅甸伊尼瓦（Inywa）附近注入伊洛瓦底江。

瑞丽江傣语古称南卯江，即雾水河，元明时期称麓川江，清代既称龙川江，也称瑞丽江。瑞丽江在云南境内长53公里，宽100-200米。瑞丽江其中20余公里属中缅两国界河，是云南省西部的重要河流之一，属亚热带长流河。瑞丽江水流平缓，清平如镜，江畔良田万顷，傣家村寨树竹环绕，风光如画，景色十分秀丽。

Shweli River (Burmese:ရွှေလီမြစ်) is a river in Myanmar (Burma). Also known as Nam Mao in Shan and Lung Chuan Chiang in Chinese, it forms part of the boundary between Burma and China. It is one of the tributaries of the country's chief river, the Ayeyarwady, and arises in Yunnan Province of China. It flows through northern Shan state and Sagaing Division, and enters the Ayeyarwady at Inywa, 60 km north of Tagaung and south of Katha.