The Living Sea (GAP)

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:It's there, throbbing and pulsing in a way that water was never meant to move. A body won't find waves here — it's an ocean with no shore. Once you enter the water — and you can, since you still don't need to breathe - you obey its rules. Remember, it's not called the Living Sea for nothing.
:: — Tarsheva Longreach, planewalker
Color pools are dangerous. Don't fool with them. Why? Well, take the Living Sea, for example.
Less than one hundred years ago, some berk (no one remembers his name, and he's probably dead now) was using a color pool to scry. While he looked through it, he did something. No one knows what it was. Some say he cast a spell, or used a magical item. Others claim that it couldn't have been something magical, but it had to be something else - maybe something inherent to the pool itself. No matter how a body looks at it, however, the berk goofed. The color pool somehow opened up inward, letting what was on the other side onto the Astral. Unfortunately, on the other side was a huge ocean on a prime-material world.
Water began pouring onto the Astral, and it still does to this day. Some addle-coves spout screed that it has to be stopped, or the Astral will someday be filled with water. These leatherheads obviously don't understand the Astral. Nothing can "fill" the Astral. There's no space to fill up. Besides, the ocean's got to run out of water someday.
So now there's a huge mass of water on the Astral. For the most part, the water has taken on a spherical shape around the color pool. However, it occasionally stretches out slightly in one direction or another, almost (so it's said) like it is reaching for something.
In fact, the chant is that the thoughts drifting through the Astral Plane have somehow affected this mass of water. Supposedly, they have imbued it with a consciousness of its own — hence the name the Living Sea. It comes from both the way the water moves and spreads, and the idea that it is a living entity all its own.
The other reason for the name is that the sea is full of life. Aquatic creatures by the thousands have poured through the color pool and onto the Astral. Sharks, fish, invertebrates, crustaceans, and various mammals live within the sea. Only a few, such as the whales, have figured out that they can leave the water and move through the rest of the plane just like any other creature. There's no need for breathing, and they can "swim" through the Astral using their mind. The vast majority of the sea life apparently assumes that it is bound by the water - just like on the Prime.
There's intelligent life within the Living Sea too: bashers called sahuagin, locathah, mermen, and others. If they ever venture out of the confines of the sea, they keep it secret, because no one's ever seen them do so.
It's the possible intelligence of the sea itself that has most graybeards busting their brain-boxes. If the chant's true, what is the sea thinking? What does it want? The Xaositects claim that it's a being of chaos, everchanging and infinitely mutable. The more lawful berks counter that it is, if anything, a creature of law, obeying established rules of physics. The Harmonium has actually made attempts to contact the creature to determine its outlook (and to convert it to their way of thinking), but to no avail. No attempts to communicate with the Living Sea have been successful — suggesting, some say, that it isn't intelligent after all. It remains a mystery.
==Within the Living Sea==
There are various locations within the vast expanse of ocean, but it should be noted that for the most part, the Living Sea is mile upon mile of water, filled only with fish, bits of plant matter, and an occasional rock or clump of mud. It's been noted that in the future, when the original ocean is closer to being fully drained, most likely there will be a great many more plants drawn in through the color pool. The plants, of course, won't grow on the Astral, but they won't die either. 
THE ASTRAL REEF. Much of this huge organic mass was pulled in through the color pool in large chunks of coral. Chant is the various intelligent races of the Living Sea used various techniques — some of them magical — to connect them all and cause the reef to flourish. This provided them with someplace to live and build homes.
The 100-mile-long reef supports a plethora of life. Crabs, lobsters, snails, sea urchins, and other creatures live on the surface, while eels, rays, and various fish live within it.
A number of small locathah clan villages dot the reefs surface, while the mermen have built a larger city, Vavuish, which trades with the locathah. Vavuish's population is said to be approximately 7,000. Chant is aquatic elves, tritons, and even marids can be found in Vavuish, but only in small numbers (there are no communities of these races in the Living Sea, but they may be visitors or small groups stranded here somehow). Within Vavuish a visitor will find dolphins, giant sea horses, hippocampi, and even a neutrally-aligned sea drake.
The sahuagin have at least three well-defended fortresses from which they launch raids on their aquatic cousins, accompanied by large well-trained sharks. Vodyanoi, ixitxachitl, kapoacinth, scrags, giant sea creatures, sea hags, and other horrible monsters inhabit the reef as well. 
THE BLACK SHIP. A few ships have been pulled in from the Prime where the Living Sea originates, although most, if not all, have apparently been wrecks that had settled at the ocean's floor. Graybeards who've looked at them closely say that they seem to be elven ships — although no one has really made the attempt to go to the prime world and investigate (and it is very difficult to get any information about the surface world from the undersea creatures that now live in the Living Sea).
One ship that isn't a wreck (or so it seems) is something known only as the Black Ship. This large vessel is made of some unknown substance impenetrable by any known force or spell. Thus, no one knows what's inside it, because it's locked up tight. 'Course, most bashers think it's full of treasure or magic or something of that nature, but others fear it could be something malign.
The Black Ship floats in the Living Sea. Most sea creatures keep their distance from the craft. 
THE DEEPS. The region of the Living Sea nearest the color pool from which the sea originated is known as the Deeps. Since it's the center of the sea, getting to the Deeps is a difficult process. A body doesn't have to worry about water pressure, like in a terrestrial sea, but he does have to swim or move against the current (which is always pouring out of — away from — the color pool). This slows movement down considerably (by at least half). This is also where a number of dangerous creatures, such as sahuagin, sea wolves, sea serpents, killer whales, and giant squids lie in wait for new prey to be brought to them via the color pool.
It may be important to note that berks hoping to go through the color pool and back to the world where the Living Sea originated (assuming that they could fight the current and the nasty inhabitants of the Deeps) are going to hit the blinds. The altered color pool now opens only inward — allowing passage onto the Astral but not out. Once all the water is drained from the ocean on the other side, things may be different. 
THF. GITHYANKI FORTRESS. A strange group of githyanki have made the Living Sea their home. These individuals declared themselves outcasts from their own society and have decided that the Living Sea will be their domain. Through the use of powerful magic and psionics, they've brought with them an entire floating island, three miles long, and built a fortress upon it in which to live. These githyanki number approximately 1,000 and are said to be allies of the sahuagin of the Astral Reef and communities of the sharkmen in the deeper, uncharted waters of the sea.
The githyanki named their fortress Gad'idine, which means "sea bastion" in their tongue. (Actually, these githyanki have adopted a number of sahuagin and mermen words for things and concepts that they did not have — including "current," "swim," and "fish.") They've even psionically dominated a dragon turtle to use as a guardian