Beginning at a point where the center line of Greencastle Road intersects the boundary line between Prince George's County and Montgomery County, and running thence easterly with the center line of Greencastle Road to the center line of Old Gunpowder Road, thence northerly with the center line of Old Gunpowder Road to the center line of Van Dusen Road, thence easterly with the center line of Van Dusen Road to the center line of Virginia Manor Road, thence southeasterly and southwesterly with the center line of Virginia Manor Road to the center line of Cinder Road, thence southeasterly with the center line of Cinder Road to the center line of Baltimore Avenue, (U.S. Rt. 1), thence southwesterly with the center line of Baltimore Avenue to the center line of Muirkirk Road, thence easterly with the center line of Muirkirk Road to the center line of Odell Road, thence southwesterly with the center line of Odell Road to the center line of Springfield Road, thence easterly and southeasterly with the center line of Springfield Road to the center line of Powder Mill Road, thence easterly with the center line of Powder Mill Road to the center line of Soil Conservation Road, thence southerly with the center line of Soil Conservation Road to the center line of Beaver Dam Road, thence westerly with the center line of Beaver Dam Road to the center line of Beaverdam Creek, thence westerly with the center line of Beaverdam Creek to the center line of Edmonston Road (Md. 201), thence northerly with the center line of Edmonston Road to the center line of Sunnyside Avenue, thence westerly with the center line of Sunnyside Avenue to the center line of the Baltimore and Ohio Railroad, thence southerly with the center line of the Baltimore and Ohio Railroad to the center line of the Capital Beltway (I-95), thence westerly with the center line of Capital Beltway to the center line of Cherry Hill Road, thence northwesterly with the center line of Cherry Hill Road to the center line of Powder Mill Road, thence southwesterly with the center line of Powder Mill Road to the boundary line between Prince George's and Montgomery Counties, thence northeasterly with said boundary line to the point of beginning.