A plateau was a land form consisting of a wide, flat, elevated plane, akin to a mountain with a flat top.
Plateaux formed naturally on Earth, (PROSE: Water's Edge, The Devil Goblins from Neptune) Justice Alpha, (PROSE: The Monsters Inside) and Vortis. (TV: The Web Planet) Featureless white plateaux could be found in the polar regions of Calufrax Major. (PROSE: The Secret in Vault 13 [+]David Solomons, BBC Children's Books (BBC Children's Books, 2018).)