Nymphija is the capital city of Oceanis. Built in the very center of Aqueous the capital city was built around the pool of purification from the legend of The Tribes and The Goddess that founded the nation.
Like many Oceanis settlements Nymphija is elevated above the surface of water. Nymphija however takes this to another level. Think of an Atlantis type city built atop roman arches, and columns.
In the middle of Aqueous Nymphija is built mostly atop shallow water. Near the edges of the city however the water becomes quite deep.