The Beastlands (PWH)

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A harmless place filled with cute little furry animals, right? Berks with that attitude won't last long here. Yes, the Beastlands abound with animals—but they're as deadly and as cunning as animals can be. Remember, dinosaurs are "just animals." No spell or training can tame the beasts here, either. Animals brought here from other planes go wild as soon as they arrive. Even planewalkers need to beware the influence this plane can have over a body's "wild side."
Beast lords and special guardians watch over the animals to make sure that the ecosystem remains balanced and that sodding leatherheads don't get it into their brain-boxes that the Beastlands' creatures are pushovers. There're also such animal-related monsters as lycanthropes, lizard men, centaurs, and more. All petitioners on the Beastlands take the forms of animals or animal-related creatures, like centaurs or wemics. The mortai, mighty cloudlike beings, fill the skies of the Beastlands, presiding over the entire plane, and in particular its skies and weather. Lastly, some aasimon and powers make their homes here as well.
This is the plane of Nature incarnate; everything about the Beastlands is wild and untamed. The only society is the hierarchy of predator and prey, the natural order of the animals. The few intelligent beings here live in relative seclusion or in very small, rugged frontier towns. 
The three layers of the Beastlands reflect the dominion of the sun and moon over nature. The first layer, Krigala, bakes under an eternal sunny noon. The second layer of Brux glows with the rosy reds of a perpetual dawn or twilight (depending on whether a berk's predisposed to see the proverbial glass as half empty or half full). The third layer is Karasuthra, the layer of night. Each layer is inhabited by beasts suited for the environment.
Tarsheva Recommends: There's said to be a magical spring in the nocturnal layer of Karasuthra whose waters, so the chant goes, restore life to a fallen comrade. The beasts of the plane avoid it, however, fearing its power, its guardian, or perhaps a curse laid upon it long ago. Some also tell tales of a powerful red dragon and even the presence of some foul tanar'ri in this layer.