The Ruak River (Thai: แม่น้ำรวก, RTGS: Maenam Ruak, pronounced [mɛ̂ː.náːm rûak]; Northern Thai: น้ำแม่ฮวก, RTGS: Nam Mae Huak, pronounced [nâːm mɛ̂ː hûak]) is a right hand tributary of the Mekong.
The mouth of the Ruak river is at the Thai-Burma border opposite Laos, a spot known as the "Golden Triangle", a popular tourist destination.
The Ruak originates within the hills of the Daen Lao Range, Shan State (Burma), and becomes the boundary river between Thailand and Burma at the confluence with the Mae Sai River near the northernmost point of Thailand.
[1] It then meanders eastwards until it empties into the Mekong River at Ban Sop Ruak, Tambon Wiang, Chiang Saen District, Chiang Rai Province.
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