Thi Lo Su is Thai for “loud waterfall”, with ‘Su’ being the word that stands for “loud”. It is also spelled in different forms: Thee Lor Sue, The Lor Sue, Thee Lor Sue, or Te-law-zue. In Karen language, which is spoken by a minority in Thailand, ‘Thi Lo Su’ means “giant” or “black waterfall”. It comes from the stream, up in the mountain called ‘Huai Klotho’, before plunging to the Umphang Forest, through large limestone rocks. Its various levels also give tourists various pools to swim in and the cave behind the waterfall is another opportunity for adventure.