Mars Feature Type Definitions

1. Albedo Feature - Geographic area distinguished by amount of reflected light
2. Arcus, arcus - Arc-shaped feature
3. Astrum, astra - Radial-patterned features on Venus
4. Catena, catenae - Chain of craters
5. Cavus, cavi - Hollows, irregular steep-sided depressions usually in arrays or clusters
6. Chaos - Distinctive area of broken terrain
7. Chasma, chasmata - A deep, elongated, steep-sided depression
8. Colles - Small hills or knobs
9. Corona, coronae - Ovoid-shaped feature
10. Crater, craters - A circular depression
11. Dorsum, dorsa - Ridge
12. Eruptive center - Active volcanic centers on Io
13. Facula, faculae - Bright spot
14. Farrum, farra - Pancake-like structure, or a row of such structures
15. Flexus, flexus - A very low curvilinear ridge with a scalloped pattern
16. Fluctus, fluctu-s - Flow terrain
17. Flumen, flumina - Channel on Titan that might carry liquid
18. Fossa, fossae - Long, narrow depression
19. Labes, labes - Landslide
20. Labyrinthus, labyrinthi - Complex of intersecting valleys or ridges.
21. Lacus - "Lake" or small plain; on Titan, a "lake" or small, dark plain with discrete, sharp boundaries
22. Landing site name - Lunar features at or near Apollo landing sites
23. Large ringed feature - Cryptic ringed features
24. Lenticula, lenticulae - Small dark spots on Europa
25. Linea, lineae - A dark or bright elongate marking, may be curved or straight
26. Lingula, lingulae - Extension of plateau having rounded lobate or tongue-like boundaries
27. Macula, maculae - Dark spot, may be irregular
28. Mare, maria - "Sea"; large circular plain; on Titan, large expanses of dark materials thought to be liquid hydrocarbons
29. Oceanus - A very large dark area on the moon
30. Palus, paludes - "Swamp"; small plain
31. Patera, paterae - An irregular crater, or a complex one with scalloped edges
32. Planitia, planitiae - Low plain
33. Planum, plana Plateau or high plain
34. Plume - Cryo-volcanic features on Triton
35. Promontorium, promontoria - "Cape"; headland promontoria
36. Regio, regiones - A large area marked by reflectivity or color distinctions from adjacent areas, or a broad geographic region
37. Reticulum, reticula - reticular (netlike) pattern on Venus
38. Rima, rimae - Fissure
39. Rupes, rupes - Scarp
40. 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."
41. Scopulus, scopuli - Lobate or irregular scarp
42. Sinus, sinus - "Bay"; small plain
43. Sulcus, sulci - Subparallel furrows and ridges
44. Terra, terrae - Extensive land mass
45. Tessera, tesserae - Tile-like, polygonal terrain
46. Tholus, tholi - Small domical mountain or hill
47. Undae - Dunes
48. Vallis, valles - Valley
49. Vastitas, vastitates - Extensive plain
50. Virga, virgae - A streak or stripe of color