Wet Mars - WE TOLD YOU SO!

[ArMaP]

You are saying the light source is in the direction of the arrow?

The light follows the direction the arrow is pointing to, so it comes approximately from the left bottom corner of the photo.

[08rubicon]

  Is that shadow on the left side of the 'lake'.? If so, then the lake must be
lower than the land it is dug into.
    rubicon

[Pimander]

  Is that shadow on the left side of the 'lake'.?

I was wondering the same thing.  There are also some parts on the other side of the "lake" that don't look right based on that being the direction of the light.

[Dyna]

Mars Express has been there for 11 years, and has found some interesting things:

March 17 2004 - Orbiter detects polar ice caps that contain 85% carbon dioxide (CO2) ice and 15% water ice.
March 30 2004 - A press release announces that the orbiter has detected methane in the Martian atmosphere.
July 15 2004 - Scientists working with the PFS instrument announced that they tentatively discovered the spectral features of the compound ammonia in the Martian atmosphere.
2005 - ESA scientists reported that the OMEGA (Visible and Infrared Mineralogical Mapping Spectrometer)(Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité) instrument data indicates the presence of hydrated sulphates, silicates and various rock-forming minerals.
March 5 2010 - Flyby of Phobos to measure Phobos' gravity.
2013 - Mars Express produces a near-complete topographical map of Mars' surface.
December 29 2013 - Mars Express performs the closest flyby to date of Phobos

Yes many things, and I like that they are thinking.
July 3, 2014

The new study indicates that liquid droplets of water could form on Mars wherever perchlorate comes into contact with water ice, opening up the possibility that environments for life could persist all over the planet.

https://astrobiology.nasa.gov/articles/2014/7/3/liquid-water-from-ice-and-salt-on-mars/

Dirt sample reveals two pints of liquid water per cubic feet

http://www.theguardian.com/science/2013/sep/26/nasa-curiosity-rover-mars-soil-water