Chamon is the homeland of alchemy, and as such little if anything about it is permanent. It is constantly shifting, as different regions and subrealms move around, interact with each other or even appear and disappear.
Naturally, Tzeentch would very much like to get his grubby little claws on it, and his forces control much of it. They once even managed to hide Sigmar's hammer there, but while the Stormcasts got it back Chamon is still a mostly Tzeentch-dominated realm. The Kharadron Overlords live here in skyports. Also, the Hollowmourne.
|The Nine Realms of the Age of Sigmar|
|Aqshy - Azyr - Chamon - Ghur - Ghyran - Hysh - Shyish - Ulgu - Realm of Chaos|