The Kuang Si Falls, known in Lao as Nahm Tok Taht Kuang Si, is a three-tiered waterfall located about 29 kilometres south of Luang Prabang.

The water flows into a turquoise blue pool before continuing downstream, with multiple cascades. Most pools, renowned for their milky turquoise waters are open for swimming and feature rope swings and an overhanging tree limb for jumping into the water.