The Pani-an River stretches about 7 kilometers from the mountains of Balasan to the sea, passing through barangays in Balasan and Estancia. Its banks are lined with mangroves and other plants that support local wildlife and provide resources for nearby communities. Historically, the river supported pottery-making, as clay from the riverbanks was used, and the river helped transport goods. Local beliefs warn against swimming at certain times due to spiritual reasons connected to the river’s guardian. Conservation efforts include dredging, tree planting, clean-up drives, and educating residents about waste management to protect the river from pollution caused by household waste.