From Halopedia, the Halo wiki
Cenobia is one of the three natural satellites in orbit around Gao, a human Outer Colony and planet in the Cordoba system. Holding an orbit that was close to Gao's other two moons, Cenobia is the closest natural satellite to the planet. Cenobia is red in color and is mostly composed of metals.
Cenobia is the location of a route known as the "Cenobian Corridor", a route popular among bio-pirates that raided Gao's jungles. During the Gao conflict in July 2553, a UNSC Navy battle group led by Admiral Tuwa used the Cenobian Corridor in a failed attempt to allude the Gao Ministry of Protection's fleet of patrol corvettes. Later in the conflict, UNSC Owl Silent Claw was forced to travel around Cenobia to avoid several pursuing corvettes from the Gao Space Navy.
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