Olympus Mons is on Mars.
Alba Mons ( formerly known as Alba Patera , a term that has since been restricted to the volcano 's summit caldera ) is an immense , low-lying volcano located in the northern Tharsis region of the planet Mars . Olympus Mons ( [ pronəˌlɪmpəs_ˈmɒnz , _ oʊ - , _ - ˈmɒns ] Latin for Mount Olympus ) is a very large shield volcano on the planet Mars . It is the tallest mountain of all planets and other rounded bodies in the Solar System , and . It is the youngest of the large volcanoes on Mars , having formed during Mars 's Hesperian Period . The volcano is located in Mars 's western hemisphere at approximately , just off the northwestern edge of the Tharsis bulge .