From the Ashes of Angels
This rich region once supported a large number of goblinoid tribes. Normally fiercely independant of each other, every now and then a powerful leader could unite many or all of the tribes for a time, during which they were a threat at least equivalent to any nation adjoining them. This ended possibly for good with an imperial crusade mustered from Rejksburg roughly 75 years ago, which decimated the native populace. Unfortunately the empire did not long survive this victory. Nobody knows what, if anything, has moved in to replace the former occupants.
Many centuries ago the region is said to have been home to a powerful kingdom (dominant race TBD). Presumeably those occupants were forced out by the goblinoids, but the specifics have faded from the knowledge of common men of this era.