Mong Mao, Möngmao or Mao kingdom (Mong is the etymological equivalent of  Thai Mueang, meaning nation) was an ethnically Dai state that controlled several smaller Tai states or chieftainships along the frontier of what is now Myanmar and China in the Dehong region of Yunnan with a capital near the modern-day border town of Ruili. The name of the main river in this region is the Nam Mao, also known as the Shweli River.