a - only a portion of this park is publicly accessible
b - This list does not include interrupted, scattered parts of administrative units, but rather entire, contiguous park-preserve tracts. Strip park area (<1000 foot (300 m) width for more than 1/2 mile (800 m)) and public utility land (reservoirs) are excluded. Much of the 72,500 acres (293 km2)
Aberdeen Proving Grounds, Maryland. and 56,000 acres (230 km2)
Quantico Marine Base, Virginia[4] are undeveloped, and constitute the largest such areas within 30 miles (48 km) of either Baltimore or Washington. Neither is generally open to the public. Quantico is contiguous with Prince William Forest Park. Washington and Baltimore are 33 miles (53 km) apart.
a - only a portion of this park is publicly accessible
b - This list does not include interrupted, scattered parts of administrative units, but rather entire, contiguous park-preserve tracts. Strip park area (<1000 foot (300 m) width for more than 1/2 mile (800 m)) and public utility land (reservoirs) are excluded. Much of the 72,500 acres (293 km2)
Aberdeen Proving Grounds, Maryland. and 56,000 acres (230 km2)
Quantico Marine Base, Virginia[4] are undeveloped, and constitute the largest such areas within 30 miles (48 km) of either Baltimore or Washington. Neither is generally open to the public. Quantico is contiguous with Prince William Forest Park. Washington and Baltimore are 33 miles (53 km) apart.