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. There is a cave behind the waterfall well worth exploring and several levels of pools for swimming.