Water on Mars exists today almost entirely as ice, though it also exists in small quantities as vapor in the
atmosphere and occasionally as low-volume liquid
brines in shallow Martian soil. The only place where water ice is visible at the surface is at the
north polar ice cap. 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 . Even more ice is likely to be locked away in the deep subsurface.