"Gazetteer of Planetary Nomenclature" . . "are named after" . "Martian naming system" . "named" . "Lunar nomenclature" . "descriptor term" . "Feature" . "Terra" . "nomenclature standards" . . "formally named" . . "cavus" . "geological features" . . "surface features" . . . "named geological features" . "Terrae" . "Planetary nomenclature#Descriptor terms (feature types)" . "terra" . "geographical features on Titan" . . "Planetary nomenclature#Mars" . "was named" . "officially named" . "rules for naming features on Mars" . "lunar nomenclature" . "Venusian craters" . "Planetary nomenclature" . . "crater nomenclature" . "planetary nomenclature" . "Working Group for Planetary System Nomenclature" . "Planetary System Nomenclature" . "naming convention" . "was formally named" . . "approved naming conventions" . "Planetary nomenclature" . . "terrae" . "planets" . . . . "nomenclature" . "fluctus" .