3. Tharsis Volcanoes: Ascraeus Mons, Pavonis Mons and Arsia Mons The Tharsis Volcanoes are a group of colossal shield ...
Olympus Mons is joined by three other large volcanoes in the Tharsis region: Ascraeus Mons, Arsia Mons and Pavonis Mons. All of these volcanoes have been dormant for millions of years, but that ...