Pavonis Mons (Darkened Natural Colors; credits: NASA/MGS/MSSS)

Caption NASA originale:"This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) wide angle color composite image, obtained in December 2003, shows the middle of the three Tharsis Montes, Pavonis Mons.
This is a broad shield volcano -similar to the volcanoes of Hawaii - located on the Martian equator at 113° W.
The volcano summit is near 14 Km (~8.7 mi) above the Martian Datum (0 elevation); the central caldera (crater near center of image) is about 45 Km (~28 mi.) across and about 4.5 Km (~2.8 mi.) deep.
Sunlight illuminates the scene from the lower left".