Back Nam Ruak (suba sa Thayland) CEB Ruak (řeka) Czech Mae Nam Ruak German Ruak French Ruak (fiume) Italian ရောက်မြစ် Burmese Ruak NB Rio Ruak Portuguese Руак (река) Russian แม่น้ำรวก Thai
| Ruak River | |
|---|---|
 | |
 | |
| Native name | แม่น้ำรวก (Thai) |
| Location | |
| Country | Myanmar and Thailand |
| Physical characteristics | |
| Source | |
| • location | Daen Lao Range, Shan Hills |
| Mouth | |
• location | Mekong at Ban Sop Ruak, Chiang Saen District |
• coordinates | 20°21′16″N 100°4′57″E / 20.35444°N 100.08250°E |
• elevation | 366 m (1,201 ft) |
| Basin features | |
| Tributaries | |
| • right | Mae Sai River |
The Ruak River (Thai: แม่น้ำรวก, RTGS: Maenam Ruak, pronounced [mɛ̂ː.náːm rûak]; Northern Thai: 
น้ำแม่ฮวก, Northern Thai pronunciation: [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.