The Occoquan River is a 24-mile-long waterway located in northern Virginia, flowing into the Potomac River. It serves as a natural boundary between Prince William and Fairfax counties. The river is known for its scenic beauty and recreational opportunities, including fishing, kayaking, and hiking along its banks. The river's watershed covers approximately 200 square miles and includes several tributaries. The Occoquan Reservoir, created by damming the river, provides drinking water to the surrounding communities. The river is also home to diverse wildlife and plays a vital role in the local ecosystem, supporting various plant and animal species.