The worm realm is divided into three regions, from North to South:

-Lumbrus: a frostbitten wasteland, and home to the only known remaining gate between realms. Freezing  

-The Helminthion Desert: arid, unforgiving and teeming with sand worms, sharp of tooth and hard of hide. 

-Ascaris: the slimiest cesspool of abhorrent filth in all the known realms, Capitol of the Worm Realm.  

***Little is known of the Isle of Bombyx, save that it is the supposed place of the Woorm King’s origin. It is said to make Ascaris look like Celania and that is quite a statement.