There is no standing water as shown below left. But there my be frozen water three to four feet in the soul under ground.

*** Opportunity *** The landing site for the second Mars Rover mission is on the Meridiani Planum.

Click here to view the Sprit Rover inside the Gusev Crater

There seems to be frost and ice at the poles of mars. Finding signs of water and life will be a challenge for the mars rover.