It is a cauldron of boiling stone.
It is a place of wastelands.
It is a plane of death and renewal.
It is the child of Earth and Fire.
At its heart, the Paraelemental Plane of Magma is a molten sea of rock. This primordial soup is the closest a mortal can get to the heart of a Material Plane world. Few things last long on a plane where worlds themselves are reduced to a roiling ocean by the power of this plane.
There is a sky above the bottomless depth of the great sea, albeit one choked with liquefied rock, volcanic gasses and pillars of fire.