The Misty Shore (PWH)

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The Ethereal Plane is a foggy realm, filled with swirling energies of various colors. It's been called an ocean of mist, not only for its multicolored vapors, but also for the fact that it has shallow and deep areas like a body of water. The shallow area is the Border Ethereal, where the Ethereal intersects with the Prime and all the Inner Planes. In the Border Ethereal, a planewalker actually exists on both the Ethereal Plane and the one it intersects with. She can see onto both (but not physically touch or affect anything in the adjoining plane), although those on the intersecting plane usually cannot see her without special aid. (Planewalkers take note: Most elemental creatures on their home planes can see onto the Border Ethereal as it intersects with that plane.)
Crossing through a curtain of swirling colors, a traveler passes from the Border to the Deep Ethereal. This is the true part of plane—the portion that fills the spaces between the Inner Planes and the Prime. Within this place, demiplanes float like strange islands of reality. While not infinite like "real" planes, they do have their own sets of physical laws, inhabitants, and landscapes. The majority of these are minor pocket demiplanes, created by mortal wizards; but some are major demiplanes, created by powers or primal forces—not unlike the Inner or Outer Planes. Sages think the latter sort may one day become real planes, but no one knows for sure. One such major demiplane, the so-called Demiplane of Dread, is the subject of much rumor and speculation. Plenty have heard of it, but no one's found it—at least, no one's found it and come back. Some berks say that another demiplane, the Demiplane of Shadow, touches every other plane through any shadow. If that's true, a planewalker might be able to make use of the place as the ultimate shortcut.
A planewalker can leave one plane by passing through the Border Ethereal, travel through the Deep Ethereal, and arrive on the "shores" of another plane touched by the Border Ethereal. Traveling through the Deep Ethereal is accomplished by pure thought—distance and speed mean nothing here. Finding one's way is never a problem, since all it takes is thinking about where a body wants to go.
But as usual, plenty of danger waits for an unwary sod. All manner of prime-material monsters can see into the Border Ethereal and attack berks there. Natives to the Deep Ethereal, such as the chronolily, phase spider, terithan, and thought eater attack travelers in both sections of the plane. Lastly, horrific storms called ether cyclones rage through the plane, hurling everything in their paths onto a random plane touched by the Ethereal.
Tarsheva Recommends: Unless a body's invited, avoid the wizard-created pocket demiplanes. They're specifically built by high-up spellslingers who value their privacy—and chances are they haven't been left unguarded.