Moreno Valley's semi-arid environment relies on engineered waterways and nearby reservoirs.
- **Lake Perris**: An artificial reservoir situated immediately south of the city. It serves as the southern terminus of the California State Water Project and features beaches (like Perris Beach) for swimming. - **Sunnymead Channel & Pigeon Pass Creek**: These are primarily engineered, concrete-lined flood control channels that manage storm-water runoff from the nearby mountains during the region's winter rains. - **Aqueducts**: The Colorado River Aqueduct passes near the region, a vital piece of infrastructure for Southern California's water supply.
