From Halopedia, the Halo wiki
Asźod was an arid, mountainous, barren and unpopulated territory in Ung, Alfold on the Eposz continent of Reach. The territory was home to several industrial facilities, including a ship-breaking facility, where the UNSC Pillar of Autumn was dry-docked on August 30, 2552 during the Fall of Reach.
Fall of Reach
During the final stages of the battle, Asźod was the only off-planet extraction point left on the continent. It was the site of the Battle of Asźod, where Emile-A239 died and SPARTAN-B312 made a last stand after successfully delivering a fragment of Cortana to Pillar of Autumn. The Spartan-III stayed behind to defend Autumn from a massive Covenant air assault, including by a Covenant CCS-class battlecruiser. He was killed in action elsewhere in the territory, having been overwhelmed by Covenant infantry.
Other than the ship-breaking yards, Asźod also appeared to be used for transport of natural resources, evident by large pipe-lines spreading across the landscape. A small set of warehouses in between two gas pipes was where many dead Spartans were found.
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