In general, the plateau's highest elevation rests in its northwest corner, closest to its hinge between Noctis Labyrinthus and the Claritas Fossae at the approach of Syria Planum to Pavonis Mons. At this location, the relief of the Thaumasia Plateau reaches up to 8 km relative to the surrounding highlands terrain. The topography diminishes to the southeast towards Argyre Planitia.