Mason District

 is a district located on the west side of River Potomac. It is overrun by Super Mutants. This is where Hubris Comics is located.

Location
 can be reached through three underground tunnels:
 * Falls Church/Mason Dst Metro] from Falls Church
 * Through the Flooded Metro from the vicinity of Arlington Library. This is not recommended unless you feel like fighting many Mirelurks in an underground radioactive maze.
 * Easiest is probably to take the Hubris Comics Utility Tunnel from the vicinity of Wilhelm's Wharf near Grayditch and Super-Duper Mart.

Points of interest

 * The Hubris Comics building in the northwest contains many useful items.
 * In the flooded park outside Hubris Comics are some Super Mutants with a captive.

Notable loot

 * A Dean's Electronics in the Pulowski Preservation Shelter just outside Hubris Comics.
 * A Guns and Bullets on the second floor of a building that overlooks the park (SW corner). A sniper rifle, Stimpak, two Frag Grenade and 3 ammunition boxes are also here in what appears to have been a sniper's nest.
 * 3 Chinese Assault Rifle and 4 ammo boxes in a cart just south of the captured wastelander.
 * 2 Chinese Assault Rifle and 3-4 ammo boxes in the Super Mutant hideout further south.

Behind the scenes

 * Mason District is an actual location in nearby Fairfax County Virginia, and it even has a park complete with play ground.