Located on the Potomac River in Garrett, Allegany, Washington, Frederick, and Montgomery Counties are 30 islands that have been designated as the Islands of the Potomac WMA. Of these Islands, three are open to public hunting in Montgomery County. These are Oxley Island, Mason Island and Maddox Island. Maddux Island is located near Poolesville, MD. It is located between Seldon Island and Tenfoot Island (both privately owned) about 2 miles downstream from Whites Ferry. It was purchased in 1970 by the Maryland DNR. This 169 acre island is part of the McKee-Beshers WMA and may also be known as Van Deventer Island. Oxley Island is located near Dickerson, MD, one mile north of Whites Ferry. It was purchased in 1993 by the Maryland DNR. This island is approximately 30 acres and is just upstream from Mason Island. Mason Island is also near Dickerson, MD, about one mile north of Whites Ferry. It was purchased by the Maryland DNR in 2015. This island is 275 acres and is just down river from Oxley Island.