Waterways have historically played a vital role in sustaining Villianur's agricultural foundations.
* **Sankaraparani River:** Also known as the Gingee River, this significant waterway flows near the commune, historically supporting the region's irrigation needs and shaping the local geography. * **Ousteri Lake:** Although situated slightly outside the town limits, this massive freshwater lake acts as a crucial watershed and reservoir for the broader Villianur and Puducherry region.