|  | | Feature Type | Description | Designation |
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| Albedo Feature | Geographic area distinguished by amount of reflected light | AL | | Arcus, arcus | Arc-shaped feature | AR | | Astrum, astra | Radial-patterned features on Venus | AS | | Catena, catenae | Chain of craters | CA | | Cavus, cavi | Hollows, irregular steep-sided depressions usually in arrays or clusters | CB | | Chaos | Distinctive area of broken terrain | CH | | Chasma, chasmata | A deep, elongated, steep-sided depression | CM | | Colles | Small hills or knobs | CO | | Corona, coronae | Ovoid-shaped feature | CR | | Crater, craters | A circular depression | AA | | Dorsum, dorsa | Ridge | DO | | Eruptive center | Active volcanic centers on Io | ER | | Facula, faculae | Bright spot | FA | | Farrum, farra | Pancake-like structure, or a row of such structures | FR | | Flexus, flexus | A very low curvilinear ridge with a scalloped pattern | FE | | Fluctus, fluctus | Flow terrain | FL | | Flumen, flumina | Channel on Titan that might carry liquid | FM | | Fossa, fossae | Long, narrow depression | FO | | Labes, labes | Landslide | LA | | Labyrinthus, labyrinthi | Complex of intersecting valleys or ridges. | LB | | Lacus | "Lake" or small plain; on Titan, a "lake" or small, dark plain with discrete, sharp boundaries | LC | | Landing site name | Lunar features at or near Apollo landing sites | LF | | Large ringed feature | Cryptic ringed features | LG | | Lenticula, lenticulae | Small dark spots on Europa | LE | | Linea, lineae | A dark or bright elongate marking, may be curved or straight | LI | | Lingula, lingulae | Extension of plateau having rounded lobate or tongue-like boundaries | LN | | Macula, maculae | Dark spot, may be irregular | MA | | Mare, maria | "Sea"; large circular plain; on Titan, large expanses of dark materials thought to be liquid hydrocarbons | ME | | Mensa, mensae | A flat-topped prominence with cliff-like edges | MN | | Mons, montes | Mountain | MO | | Oceanus | A very large dark area on the moon | OC | | Palus, paludes | "Swamp"; small plain | PA | | Patera, paterae | An irregular crater, or a complex one with scalloped edges | PE | | Planitia, planitiae | Low plain | PL | | Planum, plana | Plateau or high plain | PM | | Plume | Cryo-volcanic features on Triton | PU | | Promontorium, promontoria | "Cape"; headland promontoria | PR | | Regio, regiones | A large area marked by reflectivity or color distinctions from adjacent areas, or a broad geographic region | RE | | Reticulum, reticula | reticular (netlike) pattern on Venus | RT | | Rima, rimae | Fissure | RI | | Rupes, rupes | Scarp | RU | | Satellite Feature | A feature that shares the name of an associated feature. For example, on the Moon the craters
referred to as "Lettered Craters" are classified in the gazetteer as "Satellite Features." | SF | | Scopulus, scopuli | Lobate or irregular scarp | SC | | Sinus, sinus | "Bay"; small plain | SI | | Sulcus, sulci | Subparallel furrows and ridges | SU | | Terra, terrae | Extensive land mass | TA | | Tessera, tesserae | Tile-like, polygonal terrain | TE | | Tholus, tholi | Small domical mountain or hill | TH | | Undae | Dunes | UN | | Vallis, valles | Valley | VA | | Vastitas, vastitates | Extensive plain | VS | | Virga, virgae | A streak or stripe of color | VI |
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