33 C.F.R. § 3.25-10
Sector Virginia' office is located in Portsmouth, VA. The boundaries of Sector Virginia' Marine Inspection and Captain of the Port Zone start at a point on the Virginia-Maryland boundary at a point 38° 01'36" N latitude, 75°14'34" W longitude, thence south east to a point 37°19'14" N latitude, 72°13'13" W longitude; thence east to the outermost extent of the EEZ at a point 37°19'14" N latitude, 71°02'54" W longitude; thence south along the outermost extent of the EEZ to a point 36°33'00" N latitude, 71°29'34" W longitude; thence west to the Virginia-North Carolina boundary at a point 36°33'00" N latitude, 75°52'00" W longitude; thence west along the Virginia-North Carolina boundary to the intersection of Virginia-North Carolina-Tennessee at a point 36°35'17" N latitude, 81°40'38" W longitude; thence north and west along the Virginia-Tennessee boundary to the intersection of Virginia-Tennessee-Kentucky at a point 36°36'03" N latitude, 83°40'31" W longitude; thence northeast along the Virginia State boundary to the intersection of the Virginia-West Virginia State boundaries at a point 39°07'57" N latitude, 77°49'42" W longitude; thence southwest along the Loudoun County, VA boundary to the intersection with Fauquier County, VA at a point 39°00'50" N latitude, 77°57'43" W longitude; thence east along the Loudoun County, VA boundary to the intersection with Prince William County, VA boundary at a point 38°56'33" N latitude, 77°39'18" W longitude; thence south along the Prince William and Fauquier County VA boundaries to the intersection of Fauquier, Prince William, and Stafford County, VA at a point 38°33'24" N latitude, 77°31'54" W longitude; thence east along the Prince William and Stafford County, VA boundaries to the western bank of the Potomac River at a point 38°30'13" N latitude, 77°18'00" W longitude; thence south along the Stafford County, VA boundary to a point 38°22'30" N latitude, 77°18'14" W longitude; thence south and east along the boundary between the southern bank of the Potomac River and Stafford, King George, Westmoreland, and Northumberland Counties in Virginia to a point 37°53'11" N latitude, 76°14'15" W longitude; thence east along the Maryland-Virginia boundary as it proceeds across the Chesapeake Bay and Delmarva Peninsula to the point of origin at 38°01'36" N latitude, 75°14'34" W longitude.
33 C.F.R. §3.25-10