Quasi-Elemental Plane of Salt
The Inner Planes at the intersection of the Plane of Elemental Water and the Negative Energy Plane. It is a place of endless thirst, inhabited by natives such as salt mephits, salt elemental, and the Anhydra.
The plane is airless, rapidly destroys any water, and dessicates anything that contains it, including living creatures. The plane is lit by a sourceless white light and has a constant temperature of 70 degrees. The sky is a blank, empty white.
Near the plane of water, the plane of salt takes the form of a dense saline sea. As one goes further towards the negative plane, there is less and less elemental water, the plane becoming briny pools, then salt flats, then deserts of crystals, then towering pillars of salt, then a range of salt mountains miles high, called the Sodium Peaks, before terminating in a great cliff overlooking the infinite black wall that is the border of the negative plane.
Despite the plane's inhospitability, there are settlements, citadels, and even cities of mortal beings on it, depending on magic to survive. These places include Dessicus, Echidrine, Ionixia, and Citadel Sealt.