Planet Zamasu

Planet Zamasu (ザマスの惑星) is a secluded planet located at the edge of the universe. According to Samus, Planet Zamasu is a penitentiary planet governed by the, where they detain even the most dangerous criminals in the galaxy. Being an intergalactic mega-prison, the whole planet is heavily fortified with maximum security to ensure prevention of escape of inmates.

After the fall of the Black Cross Armada and the Grand Admiral's death, Viper and Xenogaea are revealed to be arrested by the Galactic Union Police and charged with crimes against intergalactic peace and are sent to the planet where they are detained.