Io

Io is one of Jupiter's moons.

Overview
Io, like its real-world counterpart, is slightly larger than Earth's moon. It is the fourth-largest moon in the solar system, having over 400 active volcanoes and an extremely thin atmosphere consisting mainly of sulfur dioxide.

Monster Association Arc
After being sent flying from the recoil of their own Serious Punch collide, both Saitama and Garou land on Io. The fight between them continues on this Jupiter's moon. During this, Saitama uses two of his serious moves against Garou, Serious Table Flip and Serious Sneeze, resulting in Io being badly damaged. Later on, after Saitama travels to the past and defeats Garou before this event could occur again, the damage done to Io is restored due to the reversal of causality.

Trivia

 * Although Io has an extremely thin, poisonous, and unbreathable atmosphere, neither Saitama nor Garou (in Cosmic Fear Mode) has difficulty breathing or surviving on it.

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Io