Around 6km southeast of Muang Sing, That Xieng Tung sits on a grassy plateau dotted with sacred trees, 1km up a rough access track that branches south off the Luang Namtha road 200m after Km 52. This place really comes alive at festival time (full moon of the 12th lunar month, between late October and mid-November), with a carnival atmosphere, traditional dance performances and Buddhist merit-makers offering candles and flowers around the base of the stupa.