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There is more information available on this subject at Eos Chasma on the English Wikipedia.
A birds-eye view of Eos Chasma, Mars. From Halo: Nightfall: Seed of Honor.
Eos Chasma as seen from above.[1]

Eos Chasma is a territory on the surface of Mars. Following the end of the Human-Covenant War, Misriah Armory was based in the region.[2]

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