The sunken land as it is sometimes called is now almost completely Oceanis territory. In the past it was unoccupied by any endemis nation and was home to only the Merisal people.
Aqueous is a vast water filled land. Marsh makes up the majority of Aqueous's dry land. The rest is rivers, and vast bodies of water. Most of the rivers of Vitalia actual come to end flowing into Aqueous.