Margaritifer Terra
Margaritifer Terra is an ancient, heavily cratered region of Mars. It is centered just south of the Martian equator at 4°54′S 25°00′W / 4.9°S 25°WCoordinates: 4°54′S 25°00′W / 4.9°S 25°W and covers 2600 km at its widest extent. The area reveals "chaos terrain", outflow channels, and alluvial plains that are indicative of massive flooding. Wind erosion patterns are also in evidence. A region within the terra shows some of the highest valley network densities on the planet. Ares Vallis is another notable feature, where the flood and flow patterns are in evidence; it was the landing site of Mars 6 and NASA's Mars Pathfinder. It is also one of several proposed landing sites for the Mars 2020 Rover.
Holden and Eberswalde, craters in Margaritifer Terra, are thought to have formerly held lakes because they contain deltas and iron/magnesium smectite minerals which need water to form. The * Uzboi-Landon-Morava (ULM) system of paths for water flow is found in Margaritifer Terra.
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