Most cover large, rugged areas, often including outflow channels, cratering, and "chaos terrain". They may be contrasted with the Planitia (e.g., Amazonis Planitia) and Mare (e.g., Mare Erythraeum), smoother regions of differing albedo.
Most terrains are extensive and rough, often featuring outflow channels, craters, and "chaos terrain". They can be contrasted with the smooth regions such as Planitia (e.g., Amazonis Planitia) and Mare (e.g., Mare Erythraeum), which have varying albedo.