Lord Zack's Planescape
Elemental Plane of Water
The Plane of Water is a sea without a floor or a surface, an entirely fluid environment lit by a diffuse glow. It is one of the more hospitable of the Inner Planes once a traveler gets past the problem of breathing the local medium.
The eternal oceans of this plane vary between ice cold and boiling hot, and between saline and fresh. They are perpetually in motion, wracked by currents and tides. The plane’s permanent settlements form around bits of flotsam suspended within this endless liquid, drifting on the tides.