Gehenna (PWH)

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The Fourfold Furnaces, the Fires of Perdition... these names don't begin to describe the horrors of Gehenna, where there's no escape from pain, no free will, and no mercy.
Each of Gehenna's four layers resembles a volcano floating freely in space, with a peak at both top and bottom. The volcanoes are literally hundreds of thousands of miles tall. As one proceeds from layer to layer away from the Astral Plane, the volcanoes start out fiery and tempestuous, but grow cold and dead by the fourth. No level ground exists on any of the layers, each (seemingly deliberately) as inhospitable as possible. Travelers to this plane've got to watch out for lava flows, gaseous explosions, burning grounds on the hot furnaces, and acidic snow and bitter cold on the cooling or cold ones.
The yugoloths live on Gehenna, although some claim the Gray Waste was their original case. The yugoloths remain neutral in the Blood War, but that doesn't mean they're not involved. They hire themselves as mercenaries to either side, profiting greatly from the baatezu and tanar'ri war. In fact, it's rumored they had more to do with the beginning of the Blood War than the baatezu and tanar'ri themselves.
A planewalker won't find much here but pain. One exception is the orb-town of Nimicri, which floats above the second layer. Its surprisingly organized and unified people run a fairly well-stocked bazaar, something not too common on the Lower Planes. Even better is the Teardrop Palace, the realm of Sung Chiang; anything stolen is likely to be found here. On the other hand, the Tower of the Arcanaloths holds great lore but also a messy death—chant is these yugoloths don't take to visitors kindly, and thieves less so. One mercenary company claims to have been there once, having escaped with a completely new and different type of magic. Most of these bashers have since disappeared, but it's said that the dark of this new wizardry is not necessarily completely lost.
Tarsheva Recommends: A few travelers have reported "dead areas" within this plane where its horrible effects are lessened or even missing. Some say that this comes from some sort of transference from the Gray Waste, as an effect of the magic used in the Blood War. In any event, these areas could provide a body with a moment's respite.