Io

"[...] and it's Io that's got the volcanoes."

- Hermione Granger correcting Ron Weasley's essay about Jupiter's moons

Io is one of Jupiter's moons. This natural satellite has many volcanoes. It is studied in Astronomy class, at Hogwarts School of Witchcraft and Wizardry.

Appearances

 * Harry Potter and the Order of the Phoenix