Lavalands (synonyms: magmalands, volcanic areas; example toponyms: Land of Ash, Ember’s Realm) are areas in fantasy or science fiction worldbuilding where the landscape is dominated by lava, magma, or other volcanic elements. If located underground, this area would be a magmaland. They may contain lava lakes, lava rivers, lava waterfalls, volcanoes, perilous bridges, and other elements. The may be home to fire elementals, demons, heat-resistant aliens, or other denizens.
Molten rock is called lava if it is above the ground and is called magma if it is underground.