The Nam On Dam in Phang Khon district is a multi-purpose dam in a picturesque setting. The earth dam impounds water for irrigation built across the Nam Un River, a tributary of the Songkram River which flows from the Phu Pan Mountain range. The large reservoir formed by the dam is framed by the Phu Pan mountains surrounded by lush forests and serves as a freshwater fish breeding site. The water discharge from the dam creates a small waterfall nearby.