Mason Neck is a peninsula jutting into the Potomac River to the south of Washington, D.C. It is surrounded by Belmont Bay to the west, Gunston Cove to the east, and Pohick Bay to the northeast. The Census-designated place (CDP) of Mason Neck forms the southernmost section of Fairfax County, in Northern Virginia, and comprises an area of approximately 9,000 acres (36 km2), two-thirds of which is preserved as parkland by regional, state, and national authorities.
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