Where is the largest volcano in the solar system located?

The largest volcano in the solar system is Olympus Mons, located on Mars. It is about 600 kilometers (373 miles) in diameter and rises approximately 22 kilometers (13.6 miles) above the surrounding plains, making it nearly three times the height of Mount Everest. Olympus Mons is a shield volcano, formed by the slow accumulation of lava flows over millions of years. Its immense size is due to the lower gravity and lack of tectonic plate movement on Mars, which allows lava to build up without being redistributed.