District 000

District 000 is a district of Hell on Earth, and is the home of Overlord.

Cannonically
Upon detroying the entire city, Overlord built his new Castle, which is what District 000 generally refers to since the rest of the city is in ruins.

It houses 13120 demons and 3280 within 656 war chambers on 82 floors. Thus there are 20 demons and 5 mechs per chamber, 8 chambers per floor. There also ten rest rooms between every 100 or so chambers, bringing the total of rooms 666. On the roof is a dimensional anomaly that places one into an environment similar to Dimensional Hell, where Overlord resides and is more than ready to battle anyone who trespasses on his castle.

Reality
District 000 is New York City.

Trivia

 * District 000 is the final castle of Overlord.
 * District 000 is where the final battle between the forces of Oi Igetes tis Eleftherias and Overlord takes place.
 * There are numberous descriptions of unusual murals and stained glass windows throughout Belle's exploration of the building. The majority of these are either biblical or historical references, as well as references to the past two books.