No large standing bodies of liquid water exist on the planet's surface, because the atmospheric pressure there averages just 610 pascals (0.088 psi), a figure slightly below the vapor pressure of water at its triple point;
under average Martian conditions, warming water on the Martian surface would sublime meaning transition directly from solid to vapor; conversely, cooling water would deposit meaning transition directly from vapor to solid.
Before about 3.8 billion years ago, Mars may have had a denser atmosphere and higher surface temperatures, allowing vast amounts of liquid water on the surface, possibly including a large ocean that may have covered one-third of the planet.
Water has also apparently flowed across the surface for short periods at various intervals more recently in Mars' history.
Aeolis Palus in Gale Crater, explored by the Curiosity rover, is the geological remains of an ancient freshwater lake that could have been a hospitable environment for microbial life.
brine, or salty water , could still be fuound in certain places below the surface
pbs : liquid water found on Mars
sub surface salty lake on Planum Australe:
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