Elemental Plane of Water

The plane of water is boundless ocean with specks of civilization in between. Any idiot can get there- just dive deep enough- but not getting lost and actually coming back is another matter entirely. Great bubbles of air sometimes accumulate with islands and jungles and pirates and generations go by without them ever realising how insignificant their world is. They circumnavigate their bubble and they think they’ve mapped the entirety of the plane of water with their globes. Poor insignificant fools. The plane of water is so many things and more: the Sea of Worlds, the Isle of Dread, the floating outposts built on wood and coral, towns inside the bellies of whales or sea monsters, the Sea of Ice, the Darkened Depths, the Silt Flats, the sunken planets, the nomad clans, and, of course, the City of Glass. The City of Glass is the "Sigil of the elements", the greatest city in all the inner planes, wealthier than any Prime Material country and far more populated than the City of Brass!