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Three Sisters, Washington, DC 20007, USA
contacts phone: +1
larger map & directionsLatitude: 38.9039569, Longitude: -77.0798527

Petra Holden
::Lovely set of tiny rocky islands north of DC in the Potomac River. Popular raft-up and boating location; you can swim here, since the water hasn't had a chance to be polluted downriver by the city!