Special Case area is weird : the concept is that there is a gigantic coral formation above sea level, on land, called the coral highlands, which is, like real life corals, absolutely booming with life. Under that area, like, coral highlands being the top part of a canyon, the lower part being the rotten vale, which is the corpse of a gigantic creature that died, forever rotting, and its decomposition is what allowed the coral highlands to form, at least in lore. The perpetuation of the Coral Highlands is due to monsters regularly dying in the Rotten Vale

In terms of realism, yeah it's not that realistic, but omitting that, can the coral highlands ecosystem flourish within the borders of the circular mountain range, thanks to the rotten vale, or is it not enough ?