Elemental Plane of Water

From DMG:
The nature of water is to flow, not like the gusting wind or the leaping flame, but smoothly and steadily. It is the rhythm of the tide, the nectar of life, the bitter tears of mourning, and the balm of sympathy and healing. Given time, it can erode all in its path. A warm sun arcs across the sky of the Plane of Water, seeming to rise and set from within the water at the visible edge of the horizon. Several times a day, however, the sky clouds over and releases a deluge of rain, often accompanied by spectacular shows of lightning, before clearing up again. At night, a glittering array of stars and auroras bedecks the sky.
The Plane of Water is an endless sea, called the Sea of Worlds, dotted here and there with atolls and islands that rise up from enormous coral reefs that seem to stretch forever into the depths. The storms that move across the sea sometimes create temporary portals to the Material Plane and draw ships into the Plane of Water. Surviving vessels from countless worlds and navies ply these waters with little hope of ever returning home.
The weather on the plane is a lesson in extremes. If the sea isn’t calm, it is battered by storms. On rare occasions, a tremor in the planar firmament sends a rogue wave sweeping across the plane, swamping entire islands and driving ships down to the reefs.