Located on the scenic Potomac shore near the Loudoun-Fairfax County line, Algonkian Regional Park is the perfect place for an afternoon of fun in the sun, a family vacation or even your wedding. The park includes Downpour! (a large swimming and aquatics play complex), a par-72 golf course, miniature golf, trails, a boat launch, picnic shelters, vacation cottages, and a versatile meeting center.