Tee Lor Su Waterfall can be found at Amphur Umphang, Tak Province, in Umphang National Park. It is a well-known attraction with its picturesque setting and enormous amount of water especially in the rainy season from June to October. The streams of Kloh Toh flow down to the high steep cliff. It is also the origin of the Mae Klong River. The waterfall width is 500 meters and height 300 meters and descending steps, surrounded by fertile tropical evergreen forest; it is said to be the 6th largest waterfall in the world.