Valles Marineris is located along the equator of Mars, on the east side of the Tharsis Bulge, and stretches for nearly a quarter of the planet’s circumference.
Valles Marineris (latinsko za "Marinerjeve doline", poimenovano po Mariner 9 orbiterju iz let 1971–72, ki jih je odkril) je sistem kanjonov, ki teče po Marsovi površini vzhodno od regije Tharsis.