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I was always partial to Miranda, Uranus' closest moon. Despite having a diameter of only 470km, it features the tallest cliff in the solar system at 20km high!
Because Uranus "rolls" around the sun like a bowling ball instead of spinning like the other planets, Miranda revolves perpendicular to most other moons in the solar system. This causes some pretty crazy seasons: they last more than 20 years, often with the sun visible (or not) the entire time.
Also, a 2023 study found that there's a good chance Miranda has a subsurface water ocean!