This is a list of areas of chaos terrain officially named by the International Astronomical Union on the planet Mars. Chaos terrain (or chaotic terrain) is an astrogeological term used to denote planetary surface areas where features such as ridges, cracks, and plains appear jumbled and enmeshed with one another. Coordinates are in planetocentric latitude with east longitude.
Areas of chaos terrain are usually named after a nearby albedo feature as in line with the IAU's rules on planetary nomenclature. Such an albedo feature must feature on the maps of Mars made by either Giovanni Schiaparelli or Eugène Michel Antoniadi and are listed at Classical albedo features on Mars.
| Chaos | Coordinates | Diameter (km) | Approval date | Named after | Ref | |
|---|---|---|---|---|---|---|
| 201 | 2018 | Classical albedo feature name | ||||
| 283.81 | 1976 | Classical albedo feature name | ||||
| 72.8 | 1979 | Classical albedo feature name | ||||
| 200.08 | 1982 | Daughter of Ptolemy Lagun and Bernice | ||||
| 181.37 | 1985 | From albedo feature at 30N, 173W | ||||
| 351.03 | 1976 | Classical albedo feature name | ||||
| 713.92 | 1991 | Classical albedo name | ||||
| 66.66 | 2006 | Classical albedo feature name | ||||
| 0 | 1985 | From albedo feature at 5N, 75W | ||||
| 103.35 | 2014 | Classical albedo feature name | ||||
| 658.89 | 2008 | Classical albedo feature name | ||||
| 480.51 | 1985 | Classical albedo feature name | ||||
| 497.85 | 1982 | Classical albedo feature name | ||||
| 147.63 | 2007 | Classical albedo feature name | ||||
| 234.48 | 1985 | Albedo feature name | ||||
| 113.73 | 2006 | Classical albedo feature name | ||||
| 150.71 | 1985 | From albedo feature at 24S, 154W | ||||
| 590.62 | 1994 | Named for albedo feature Hellas | ||||
| 336.04 | 1976 | Classical albedo feature name | ||||
| 66 | 2014 | Classical albedo feature name | ||||
| 419.04 | 1976 | Classical albedo feature name | ||||
| 21.72 | 2006 | Classical albedo feature name | ||||
| 450.51 | 1976 | Classical albedo feature name | ||||
| 109.1 | 1985 | From classical albedo feature at 10N, 56W | ||||
| 383.67 | 1976 | Classical albedo feature name | ||||
| 48 | 2017 | Classical albedo feature name | ||||
| 283 | 1985 | Named for albedo feature at 20N, 65W | ||||
| 24.12 | 2006 | Classical albedo feature name | ||||
| 162.35 | 1982 | Albedo feature name | ||||
| 34.37 | 2006 | Classical albedo feature name |
This list was adapted from the public domain Gazetteer of Planetary Nomenclature, courtesy of the United States Geological Survey.