Glossary of Mars features
The following definitions as used by Google Mars. This table serves as a starting point for more detailed descriptions of each Martian surface feature. Use examples from the Regions Category.
| Term | Description |
| Albedo | Geographic area distinguished by amount of reflected light |
| Catena, catenae | Chain of craters |
| Cavus, cavi | Hollows, irregular steep-sided depressions usually in arrays or clusters |
| Chaos | Distinctive area of broken terrain |
| Chasma, chasmata | A deep, elongated, steep-sided depression |
| Colles | Small hills or knobs |
| Crater, craters | A circular depression |
| Dorsum, dorsa | Ridge |
| Fluctus | Flow terrain |
| Fossa, fossae | Long, narrow, shallow depression |
| Labes | Landslide |
| Labyrinthus, labyrinthi | Complex of intersecting valleys |
| Lingula, lingulae | Extension of plateau having rounded lobate or tongue-like boundaries |
| Mensa, mensae | A flat-topped prominence with cliff-like edges |
| Mons, montes | Mountain |
| Patera, paterae | An irregular crater, or a complex one with scalloped edges |
| Planitia, planitiae | Low plain |
| Planum, plana | Plateau or high plain |
| Rupes | Scarp |
| Scopulus, scopuli | Lobate or irregular scarp |
| Sulcus, sulci | Subparallel furrows and ridges |
| Terra, terrae | Extensive land mass |
| Tholus, tholi | Small domical mountain or hill |
| Undae | Dunes |
| Vallis, valles | Valley |
| Vastitas, vastitates | Extensive plain |
Original source: http://www.google.com/mars/glossary.html
