Ruak River

Ruak River
View of the confluence of the Ruak river with the Mekong
Native name	แม่น้ำรวก
Country	Myanmar and Thailand
Basin features
Main source	Daen Lao Range, Shan Hills
River mouth	Mekong at Ban Sop Ruak, Chiang Saen District 366 m (1,201 ft) 20°21′16″N 100°4′57″E / 20.35444°N 100.08250°E / 20.35444; 100.08250Coordinates: 20°21′16″N 100°4′57″E / 20.35444°N 100.08250°E / 20.35444; 100.08250
Tributaries	Right: Mae Sai River

The Ruak River (Thai: แม่น้ำรวก, Lanna: , rtgs: Maenam Ruak, Thai pronunciation: [mɛ̂ːnáːm rûək]) 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. It then meanders eastwards until it empties into the Mekong River at Ban Sop Ruak, Tambon Wiang, Chiang Saen District, Chiang Rai Province. The boundary section of the river is 26.75 kilometres (16.62 mi) long.