Khao Koi Nang Rapids is located within the Mae Wong National Park. This area features rocky rapids and streams, situated 1,400 meters from the Mae Wong National Park office along the Khlong Lan-Aum Phang road. After a 400-meter detour, you'll arrive at a large rocky area where the Khlong Khlung stream flows through. This stream is one of several that eventually feeds into the Ping River. From the rapids, if you hike along the stream for about 350 meters, you'll reach the beautiful Phakoi Nang Waterfall. This small yet striking waterfall consists of four tiers, each standing about 20 meters high.