Center is at Latitude 30 Degrees South, Longitude 90 Degrees

The top half of Mars is dominated by the Tharsis Montes volcanoes, the large Alba Patera shield volcano, the dark Chryse basin, and a vast canyon system, Valles Marineris in this image from NASA's Viking Orbiter 1.

http://photojournal.jpl.nasa.gov/catalog/PIA00195