The Thi Lo Su Waterfall is claimed to be the largest and highest waterfall in Thailand. It stands 250 metres (820 ft) high and nearly 450 metres (1,480 ft) wide on the Mae Klong River, flowing down from Huai Klotho into the Umphang Wildlife Sanctuaryin Tak Province in northwestern Thailand.
The waterfall has apparently never been surveyed, so the figures given are approximate.