Phra That Si Song Rak

Phra That Si Song Rak is a revered stupa in Dan Sai, Loei, and one of the most historically resonant monuments in the northeast. Built around 1560 by the kings of Ayutthaya and Lan Xang (early Laos), its name means “the stupa of the love of two nations” — it sealed a pledge of peace and a shared border between the two kingdoms. It’s free to visit, but note one firm local custom: don’t wear red.

History and meaning

In the mid-16th century, Ayutthaya and Lan Xang allied against Burmese expansion and agreed not to encroach on each other’s land. To witness that pact they jointly raised this stupa on the Man River — a roughly 20-metre whitewashed tower in Lan Chang (Lao) style, plain and dignified rather than gilded. Centuries on it remains a working pilgrimage site, and Loei holds an annual offering ceremony here each 15 May. Its silhouette appears on the provincial seal.

Insider Tip: Leave anything red behind — clothing, bags, even a red phone case draws a quiet word from the keepers. Red stands for blood and war, at odds with the monument’s whole message, so the no-red custom is taken seriously.

Visiting

The stupa is in Dan Sai, the same district famous for the masked Phi Ta Khon festival, so it pairs naturally with that if your timing lines up. It’s a rural site reached by road — your own vehicle or a local ride — with modest facilities. Dress conservatively, as at any sacred place.

Watch out: Ignore any listing that places this “near Phu Chi Fa” — that viewpoint is in Chiang Rai, hundreds of kilometres away. Phra That Si Song Rak is firmly a Loei/Dan Sai sight.

Phra That Si Song Rak is at Dan Sai, Loei 42120. View on Google Maps.