is about 9 kilometres from the Chiang Saen old town to the north along the road parallel to the Mae Khong River. The area is locally referred to as “Sop Ruak”, Where the Mae Khong meets the Ruak River. This is where the borders of three countries, Laos, Myanmar and Thailand, come together. There are remains of many ancient places and structures attesting to the area having been settled by people in the past. It is also where various legends on the Lanna ancestors originate.
Around Sop Ruak are boat rental service to view the scenery around the Golden Triangle. In addition, boats can be hired to cruise from Sop Ruak along the Mae Khong River to chiang Saen and Chiang Khong which takes around 40 minutes and 1 1/2 hours respectively.