The Quiet Below is a series of caverns that snake miles below the surface of the continent. No great civilizations lived there, and there are no known resources that couldn't be gathered closer to the surface, so rarely do people venture into the underground caves.
Superstitious people believe that it's harder for the God's blessings to reach you below the surface, and dangerous monsters lurk in the dark depths, so the only people who reside here are doing so to avoid the public eye.