Than Ngam Waterfall This falls is locates in the vicinity of Thab Kung Subdistrict, Nong Saeng District though Udon Thani- Nong Bua Lamphu route making left turn to reach Nong Saeng District being a distance of 45 km. and continuing by a foot trip of five kilomaters to the falls. Tham Nang is a medium sized waterfall whereone can swim is its resevoir and a foot trio can be made from the resevoir to reach the watershed.