You start out at one of the entrances to the Catacombs (top right map) and use this zone to gain entrance to the other 3 zones.
U - Entrance to Underground Lake (east)
B - Entrance to Bandit Camp (north)
A - Entrance to Ant Farm (east, NPK zone)
@ - Entrance to Catacombs of Toshi
Arrows - Stairs
T - Queen Toshi
A - Entrance to Ant Farm
Top Right - Middle level
Bottom left - Lower Level
Bottom Right - Upper Level
You start out at the A, then go east and down. This will take you to the top right map of the Ant Farm. That map is the middle level. These 3 maps are stacked one on top of the other. From the middle level, you can either go up to the upper level or down to the lower level.. It will make sense once you run it a time or two. Good Luck.