Nang Sawan Waterfall, located in the Ang sub-district within the Khau Poo-Khau Ya National Park, is a charming small waterfall. It is fed by underground springs from the Banthat Range and the Dantrang Mountain Range, flowing into the Huay Nam Sai Reservoir. The surrounding atmosphere is serene and lush, enveloped by towering trees. The waterfall cascades down limestone cliffs into a pool that offers both deep and shallow areas for swimming.