Dan Sai
Dan Sai lies on the Man River in the uplands between the old kingdoms of Ayutthaya and Lan Xang. Here stands Phra That Si Song Rak, a Buddhist stupa raised as a monument to friendship between their rulers. King Maha Chakkraphat of Ayutthaya and King Setthathirath of Lan Xang began the shrine in 1560; it was completed in 1563. Its name recalls the bond between the two kingdoms.