Mangala Vallis
Mangala Vallis is a major channel system that contains several basins which filled, then the overflow went through a series of spillways. One source of waters for the system was Memonia Fossae, but water also probably came from a large basin centered at 40 degrees S.
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Mangala Valles, as seen by HiRISE.
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Mangala Vallis with a streamlined island, as seen by THEMIS.
Read more about this topic: Memnonia Quadrangle