The Southern Capital.
Unlike the other three regions that had an abundance of sun and rain, the harsh environment did not allow the inhabitants to become farmers or build many fantastic looking cities. The South had extended periods of dry seasons for most of the year and instead of a winter, it merely got colder in the second half of the year.
The winter desert season as they had dubbed it was just as harsh as winter and the winds blew along with the white sand all around them. There was little rain, so each Oasis became a precious hub for life around it. Ironically the skies were full with imposing grey clouds yet while it rarely rained, it often thundered.
The Southerners had been forced to adapt and improvise a lot for their survival ever since the first group of people set foot into this abyssal sandpit of white death. It was practically a miracle that they had somehow persevered long enough to create a long lasting civilisation.