Instead, there's so little atmosphere left on Mars that pure, uncontaminated liquid water is actually impossible at most locations on Mars. These features may have been telltale signs of an ancient past where liquid water was abundant, but that's no longer the case today. Evidence of ancient flows leading into great oceanic basins, possibly even including tidal rhythmites, abounds all over the red planet. Features like dried-up riverbeds - often featuring oxbow bends like those found on Earth - stream throughout the landscape. Seasonal ices can be found not only at the poles, but in various basins and craters dotting the Martian surface. There is an overwhelming amount of evidence that Mars had a watery past. These are just a few of the many lines of evidence that point to a watery past on Mars. Seasonal frozen lakes appear throughout Mars, showing evidence of (not liquid) water on the surface.
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