Huai Sai Waterfall, Ban Huai Kong, Pa Ko Subdistrict, Chanuman District, is a waterfall formed by an overflowing dam of Huay Sai Reservoir. The surrounding area is a rock formation. There is water in cascades along the rocks which tourists call Kaeng Khoi Nang Behind the waterfall, the water flows into a small stream. There is a succulent fern forest beside the sand creek in abundance. It is another wetland area that is suitable for recreation of tourists in general as well.