THE ELEMENTAL PLANE OF FIRE
Fire rules supreme here. If a thing can burn, it burns immediately upon entering the plane. Sods traveling here unprotected suffer damage just by arriving on the plane. Travelers have to figure out some way to breathe fire or they will suffocate faster than they'll burn to death.
Unlike
the other three main Elemental Planes, Fire has got a definite up and down.
Most of the plane is a huge ocean of fire, but sometimes a body can find islands
of burning, scorched earth or hard chunks of obsidian that resist the flames;
in these places a sod encounters efreeti, hell hounds and the settlements
of the flame lords. In the depths of the fire itself live fire mephit, elementals,
fire minions, fire snakes, harginn, salamanders and many other creatures.
Of all the Inner Planes, this is the plane that berks fear most. The Plane of Fire is often thought of as an evil plane, but a canny basher knows that all the Inner Planes are beyond alignments and concepts of good and evil.
The most famous spot on this plane is the City of Brass, the realm of the efreeti. They have a spell that renders a being immune to flame and heat as long as he remains in the city. This magic is used upon their numerous captured slaves. In this city efreeti forge weapons and items crafted of a special material they call white iron.
Another interesting (but lethal) site is the Molten Tower of Kossuth, the tyrant king of all the fire elementals, where intruders are burned alive in fires so hot that they scorch even fire-based creatures. It's said that this place is virtually unlivable to any but actual fire elementals.