Thi Lor Su Waterfall is the largest and most beautiful waterfall in Thailand. Located in Umphang Wildlife Sanctuary, Tak Province, which is a limestone mountain waterfall. Flows in cascades, with a height of about 300 meters, surrounded by complete rainforest. If you want to visit there, they allow the car to enter until the tent area near Umphang Wildlife office or you can go by rubber boat because it will see a nature including a small waterfall. Then, after reaching the tent point, walk into the waterfall for about 1.5 km. You will reach Thi Lor Su Waterfall as well. If anyone wants to visit. we recommended November to December because the waterfall is very clear and the color of the waterfall is the most beautiful.