Stock Photo - MARS Reull Vallis -- 14 Jan 2004 -- This picture was taken by the High Resolution Stereo Camera (HRSC) onboard ESA's (European Space Agency) Mars Express orbiter, in colour and 3D, in orbit 18 on 14 January 2004 from a height of 275 km. The location is south of Vallis Marineris at 15¡ South and 323¡ East. The resolution is 12 m per pixel, the area is 50 km across and shows a tectonically controlled karst- like structure in a vertical view. North is at top. Mars Express's sensitive instruments have already picked up signs frozen water at the Martian South Pole, backing up evidence from NASA missions that the planet once had oceans of it's own in the past and may still have some of this water retained beneath the surface. NB This is a non-corrected version of the original ESA release -- Picture © Lightroom / ESA.