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, which links with the Thung Yai Naresuan and Huay Kha Kaeng Reserves, as well as Khlong Lan and Mae Wong National Parks. Together, they form Thailand's largest wildlife haven and one of Southeast Asia's few virgin forest.