What are the approximate diameter and depth of the summit crater of Mount Fuji?

Diameter: Approx. 780 meters
Depth: Approx. 200 meters

Hello! Regarding the crater at the summit of Mount Fuji, let me explain it to give you a clear visual idea.

That huge depression at the top of Mount Fuji is its main crater, known in Japan by the specific name "Ōuchi-in".

The crater's diameter is approximately 780 meters.

To put that into perspective:
- Imagine a standard 400-meter track. The crater’s diameter is roughly equivalent to two such tracks placed end to end.
- If you stood on one side of the crater and tried to wave to someone opposite, they would be hard to see clearly.

The crater's depth is about 200 meters.

To understand this scale:
- The average residential floor height is about 3 meters. So 200 meters is roughly the height of a 65-story skyscraper.
- When you finally reach the summit after a strenuous climb and peer over the crater rim, that sense of profound depth is truly awe-inspiring.

Japan's highest point is here: Japan's highest peak, the 3776-meter-high "Kengamine peak", is actually located on the rim of this crater.
You can walk around it: Many climbers take on the "ultimate challenge" after summiting: walking a full circuit around this enormous crater. Known in Japanese as "Ohachi-meguri" (Bowl Circuit), because the crater resembles a giant bowl. Completing the circuit takes about 1.5 hours.
Not perfectly round: Although we refer to its "diameter", it’s not a perfect circle, more like an irregular ellipse.

So, to summarize simply:

Hope this explanation helps!