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Aram Chaos is the circular depression in the top left. Iani Chaos is in the bottom right.
Iani Chaos, the source region of Ares Vallis on Mars, is centered at ~342°E, 2°S. The chaotic terrain is widely believed to have formed via the removal of subsurface water or ice, resulting in flooding at the surface, and the formation of Ares Vallis. Within Iani Chaos, deposited stratigraphically above the chaotic terrain, are smooth, low-slope, intermediate-to-light-toned deposits that are rich in a hydrated mineral that is most likely gypsum as well as hematite[1].
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