The Boiling Sea
The area now known as The Boiling Sea was just an unremarkable stretch of The Cenarian Ocean near the mouth of the Inland Sea.
Undersea vents and elemental energy makes the water here permanently boil, Presenting a major hazard to sailors. While causing the area to be covered in constant clouds.
The constantly boiling water releases massive clouds, part of the reason for the sudden storms and fogs that plague The Remnants. As a hazard it forces trade with the North to either go around the long way, risking the dangers of The Cenarian Ocean, or to instead trade with the Cinder Dwarves of The Black Mountains.
The superheated water has no normal creatures living in it, but the giant leatherfish that spawn there often make their way into the Northern seas of The Remnants or the Southern stretches of The Tempestuous Ocean