THE MARTIAN ICE LAKE
With the discovery of water-ice on Mars, scientists are taking a closer look at this feature in an unnamed crater on the plains of the Vastitas Borealis in Mars' Northern polar region.
At a time when the carbon dioxide ice has evaporated, this round deposit of ice remains leading those scientists to believe that it is actually a large collection of water-ice.
How large? The crater itself is over 35 kilometers across and two kilometers deep. The deposit could easily make colonization of the area (in the far future, of course) a distinct possibility. This area could also be where confirmed extraterrestrial life discovered.