Located on a hill by the Man River and built in 1560 on the border of the Ayutthaya and Lang Xang Kingdoms, Phra That Si Song Rak symbolizes the resolve of the kings of these two kingdoms not to invade each other's territory and to join forces against Burmese invaders. The temple was built in a style similar to that found in Laos and has a 30-meter-high 'chedi'. Phra That Si Song Rak is a focal point of a festival in May where residents of Dan Sai district offer items made of candle wax to the temple's monks.