Space
How big is a Olympus Mons?
The Olympus Mons is 21.9 km (14 mi) tall.
Measurements
| Length | 600 km (373 mi) |
| Height | 21.9 km (14 mi) |
The largest known volcano in the Solar System, on Mars: about 21.9 km high — roughly 2.5× Mount Everest — with a base some 600 km across, about the size of France. Its slopes are so gentle (~5°) that from the base you couldn't see the summit.
Did you know?
- Its summit caldera alone is about 80 km wide — Everest's entire base would fit inside it.
- Standing on the Martian surface at its edge, the volcano would stretch beyond the horizon — you couldn't see it as a mountain at all.