Water on Mars exists today almost exclusively as ice, with a small amount present in the atmosphere as vapor] The only place where water ice is visible at the surface is at the north polar ice cap. There is also strong evidence to suggest that liquid water exists on the surface of Mars during summer periods.Abundant water ice is also present beneath the permanent carbon dioxide ice cap at the Martian south pole and in the shallow subsurface at more temperate latitudes.More than five million cubic kilometers of ice have been identified at or near the surface of modern Mars, enough to cover the whole planet to a depth of 35 meters. Even more ice is likely to be locked away in the deep subsurface.
https://en.wikipedia.org/wiki/Water_on_Mars
http://www.theguardian.com/science/across-the-universe/live/2015/sep/28/water-on-mars-buildup-to-nasa-mystery-solved-announcement-live
https://www.reddit.com/r/space/comments/3mjrdt/nasa_to_confirm_active_briny_water_flows_on_mars/
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