https://www.engadget.com/2018/01/12/...sance-orbiter/
NASA and private companies like SpaceX are busy planning Mars missions, but only have a vague idea of how they're going to find critical water supplies. Now, using the Mars Reconnaissance Orbiter (MRO), researchers have discovered abundant, easy-to-access H20. A survey found no less than eight sites where cliff erosion has exposed thick deposits of nearly pure ice that lie just three to six feet below rock and dust. The findings mean that future missions, both manned and robotic, may have an easier time than expected digging up water for drinking and making rocket fuel.
As reported in the journal Science (paywall), the water was found in both the north and south of Mars, at latitudes equivalent to South America and Scotland. The exposed areas were found on scarps as steep as 55 degrees. Based on the absence of craters in the regions, scientists believe that the features formed relatively recently.