Zuun is the birth planet of the Legionnaire Brin Londo. Zuun is a human mining colony settled sometime after the 21st century.
The planet planet has been ravaged by centuries of extremely thorough exploitation. A highly ductile and malleable metal known as Zuunium can be found here. Mining this rare metal has devastated the planet, poisoning its seas and fatally polluting its atmosphere.
The residents of Zoon live in small communities within the caverns which crisscross beneath the surface. Zoon orbits within a highly unstable triple star system.
The Planet was mostly abandoned leaving only the poor miners who were left to mutate into monstrous forms.