IAU descriptor term
Plana in the Solar System
Planum is the term planetary geologists use for a high plain or plateau. 49 named features carry it, across 5 of the 14 mapped worlds, the largest being Lakshmi Planum on Venus at 2,345 km.
Where they are
The largest plana anywhere
Ranked across every mapped world, by catalogued diameter.
1Lakshmi PlanumVenus2,345 km2Astkhik PlanumVenus2,000 km3Daedalia PlanumMars1,922 km4Lunae PlanumMars1,818 km5Solis PlanumMars1,811 km6Nepenthes PlanumMars1,650 km7Hesperia PlanumMars1,602 km8Planum AustraleMars1,430 km9Argentea PlanumMars1,371 km10Syrtis Major PlanumMars1,215 km11Viriplaca PlanumVenus1,200 km12Meridiani PlanumMars1,059 km13Sisyphi PlanumMars1,033 km14Parva PlanumMars1,027 km15Amenthes PlanumMars953 km16Sinai PlanumMars901 km17Lucus PlanumMars900 km18Nemea PlanumIo889 km19Malea PlanumMars873 km20Aeolis PlanumMars853 km21Promethei PlanumMars831 km22Olympia PlanumMars804 km23Turan PlanumVenus800 km24Thaumasia PlanumMars800 km25Syria PlanumMars736 km26Catuilla PlanumMercury735 km27Bosporos PlanumMars730 km28Ogygis PlanumMars711 km29Ophir PlanumMars642 km30Ascuris PlanumMars618 km
What they are named after
Naming themes are set per world, so one descriptor can draw on very different sources depending on where it sits. Across all 49 plana, 11 categories appear.
Greek24Latin14Italy2Egypt2Inca1India1Armenian1Romania (Rumania)1