The most famous water fall in Tak is, Namtok Thi Lo Su ( Thi Lo Su waterfall ) is located in the Umphang Wildlife Sanctuary, a UNESCO World Heritage site.
The biggest and the most beautiful waterfall in Thailand, Namtok Thi Lo Su is also considered the sixth biggest waterfall in the world. The waterfall itself originates from Huai Klotho, streaming along limestone cliffs at a breath of 500 meters, the height of 160-170 meters down to cascading tiers which are surrounded by intact natural forests.