The city is built in layers. The dark areas of the map represent the upper works. These areas are built above lower warrens, pierced by stairways, ramps, and cage elevators. The streets below these areas roughly follow those of the upper levels. Better areas of the lower city are well lit with lanterns, but many of these tunnels are in perpetual gloom.

The light ares of the map are main avenues, open to the sky like any other city.