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  • Chryse Planitia is a smooth circular plain in the northern equatorial region of Mars close to the Tharsis region to the west, centered at 26°42′N 320°00′E / 26.7°N 320.0°E. Chryse Planitia lies partially in the Lunae Palus quadrangle and partially in the Oxia Palus quadrangle. It is 1600 km or 994 mi in diameter and with a floor 2.5 km below the average planetary surface altitude, and is thought to be an ancient impact basin; it has several features in common with lunar maria, such as wrinkle ridges. The density of impact craters in the 100 to 2,000 metres range is close to half the average for lunar maria. Chryse Planitia shows evidence of water erosion in the past, and is the bottom end for many outflow channels from the southern highlands as well as from Valles Marineris and the flanks of the Tharsis bulge. It is one of the lowest regions on Mars, so water would tend to flow into it. The elevation generally goes down from the Tharsis Ridge to Chryse. Kasei Valles, Maja Valles, and Nanedi Valles appear to run from high areas to Chryse Planitia. On the other side of Chryse, to the east, the land gets higher. Ares Vallis travels from this high region, then empties into Chryse.

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