code/modules/worldgen/mapgen/_MapGenerator.dm 
| /var/biomes | All possible biomes in assoc list as type || instance |
|---|---|
| /proc/initialize_biomes | Initialize all biomes, assoc as type || instance |
| /datum/map_generator | This type is responsible for any map generation behavior that is done in areas, override this to allow for area-specific map generation. This generation is ran by areas on world/proc/init(). |