Rhea

Rhea was a moon of Saturn. It was colonized and mostly terraformed by humans, wishing to get away from the drama of the inner solar system in the time leading to the Great War. However, a virus of unknown origin broke out on the moon, turning humans and animals alike feral and dangerous to society. Because of this, the moon was quarantined. Now, it is full of overgrown cities, jungles, and plains, and due to the feral creatures on the moon it is considered one of the most dangerous places in the solar system.