Fountainhead Regional Park is an approximately 2,000 acre park bordering a tributary of the Potomac River. The Park contains rolling hills, dense forests, and a stream (now a reservoir) that flows into the Potomac River. It has a mountain biking trail, preserved 18th century cemetery, four shared-use equestrian trails, miniature golf course and a fishing lake. The Bull Run-Occoquan Trail begins (or ends) in this park, and continues upstream through Hemlock Overlook Regional Park to Bull Run Regional Park in Centreville. Fountainhead Park borders Fairfax Station and Clifton, Virginia, with land-use restrictions adjacent to the park to protect the water supply for half of Fairfax County, as well as ecosystem. Most of the park is closed during the winter.
The park's unique feature in Northern Virginia is the 10.9 miles (17.5 km) mountain biking trail which was improved and rehabilitated by the Fountainhead Project, funded by a grant, local and state government resources along with business and private donations.
The park also features water activities between mid-March and November. Canoe, kayak and jon boat (with small engine) rentals are available, as are fishing supplies (a fishing license is required). Guided canoe trips and paddleboard lessons are offered during the summer. Boats launched from the park (fee charged) are limited to motor sizes at or under 10 horsepower.
The park is administered by the Northern Virginia Regional Park Authority.