I made this map for Earth last week and you seemed to like it so here is it for Mars, the distribution of elevation levels on the earths surface. I have used a blue-red colourmap to give it the illusion of oceans. Negative values indicate terrain below the Mars areoid — a gravitational reference surface defined where atmospheric pressure equals 610.5 Pa (the triple point of water) — which serves as the zero-elevation datum in place of a sea level.