I'm quite sure that the largest volcano is in Mauna Loa in Hawaii if you talking about area, and if you mean height, then I think it would be in Ojos del Salado in Chile and Argentina, reaching a height of 6892m high.
If you would like to check this info then just search "Where is the world's largest volcano located", that where I got my answer.
The answer that I think it is: Mt. Guallatiri in Chile:
Guallatiri is one of the most active volcanoin northern chile. It is just west of the border with boliviaand at the southwestern end of the nevados-de-quimsachata. It is a symmetrical 6,071 m high ice-clad stratovolcano. Guallatiri is capped by a central dacitedome or lava complex, with the active vent at its southern side.
Olympus Mons is the largest volcano in the solar system, but it is not active. The largest active volcano is Mauna Loa in Hawaii.
The world's largest active volcano is the Mauna Loa in Hawaii.Mauna Loa in Hawaii.
aso
I think such any devastating volcano is not present
Mars, but the volcano is probably not active now.
Mauna Loa
A. Hawaii.
stevens
Olympus Mons on Mars
Hawaii's largest island
Mount Etna in Italy is the largest volcano in Europe. It is one of the most active volcanoes in the world and has a height of about 10,922 feet. Etna has been continuously erupting for thousands of years and poses a potential threat to nearby communities.
There are about 70 volcanoes named on Antarctica. The most active one is called Mt Erebus.