Waterways define much of Flower Mound's southern and western geography, shaping both its climate and its recreational culture.
* **Grapevine Lake:** An 8,000-acre reservoir forming the town's southern border. It is essential for regional flood control, municipal water supply, and extensive aquatic recreation. * **Denton Creek:** A significant tributary that feeds into Grapevine Lake, winding through the western edge of the town. * **Timber Creek:** A local creek that meanders through several parks and greenbelts, enhancing the natural landscape of the town's residential neighborhoods.