A Cataclysmic Upswelling of Groundwater Carved This Channel on Mars
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A Cataclysmic Upswelling of Groundwater Carved This Channel on Mars

Shalbatana Vallis is a 1300 km water channel on Mars. It was carved out in one cataclysmic flooding event, possibly triggered by a massive impact. It's more evidence that liquid water once flowed on Mars.