Colourenhanced fisheye view of Mars Mosaic of images made by the Viking Orbiter centred on the Valles Marineris canyon system This point perspective image simulates a fisheye lens view from a spacecraft about km above the surface and covers an area of about degrees latitude by degrees longitude Valles Marineris runs across centre frame with the smaller dark Hebes Chasma above Running north top from Hebes are ancient river channels Near the top left are two circular dark features the volcanoes Ascraeus Mons upper and Pavonis Mons lower The large dark area at far right is Chryse Planitia
