IAU descriptor term
Valles in the Solar System
Vallis is the term planetary geologists use for a valley. 249 named features carry it, across 5 of the 14 mapped worlds, the largest being Baltis Vallis on Venus at 6,000 km.
Where they are
The largest valles anywhere
Ranked across every mapped world, by catalogued diameter.
1Baltis VallisVenus6,000 km2Valles MarinerisMars3,761 km3Citlalpul VallisVenus3,160 km4Laidamlulum VallisVenus2,700 km5Ares VallisMars1,758 km6Tiu VallesMars1,720 km7Ikhwezi VallisVenus1,700 km8Kasei VallesMars1,580 km9Maja VallesMars1,515 km10Marikh VallisMars1,147 km11Uottakh sulus VallesVenus1,100 km12Reull VallisMars1,052 km13Shalbatana VallisMars1,029 km14Mamers VallesMars1,020 km15Simud VallesMars988 km16Hrad VallisMars974 km17Jutrzenka VallisVenus970 km18Ma adim VallisMars913 km19Gendenwitha VallisVenus900 km20Kallistos VallisVenus900 km21Mangala VallesMars900 km22Xulab VallisVenus820 km23Tan yondozo VallisVenus800 km24Dao VallisMars794 km25Loire VallesMars790 km26Granicus VallesMars778 km27Bennu VallisVenus710 km28Ahsabkab VallisVenus700 km29Koidutaht VallisVenus700 km30Kumsong VallisVenus700 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 249 valles, 117 categories appear.
Italy16France13Greek11United States10Germany7Spain7China6Egypt5