33 C.F.R. § 3.25-15
Sector Maryland-National Capital Region's office is located in Baltimore, MD. The boundaries of Sector Maryland-National Capital Region's Marine Inspection Zone and Captain of the Port Zone start 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 north west to a point at 38°26'25" N latitude, 74°26'46" W longitude; thence west to the intersection of the Maryland-Delaware boundary and the coast at a point 38°27'03" N latitude, 75°02' 55" W longitude; thence west to a point 38°27'15" N latitude, 75°30'00" W longitude on the Delaware-Maryland boundary; thence proceeding along the Delaware-Maryland boundary west to a point at 38°27'37" N latitude, 75°41'35" W longitude; thence proceeding north to the Maryland-Delaware-Pennsylvania boundary at a point 39°43'22" N latitude, 75°47'17" W longitude; thence west along the Pennsylvania-Maryland boundary to the Pennsylvania-Maryland-West Virginia boundary at a point 39°43'16" N latitude, 79°28'36" W longitude; thence south and east along the Maryland-West Virginia boundary to the intersection of the Maryland-Virginia-West Virginia boundaries at a point 39°19'17" N latitude, 77°43'08" 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 south east to a point 38°20'30" 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. §3.25-15