Halo Alpha
Halo Alpha

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Gao, known to the Forerunners as Edod was an independent outer colony world located in the Cordoba system.


This section requires expansion.

In 2553, the UNSC descended upon the Montero Cave System. They declared the cave system restricted. Casualties were mounting due to these efforts, which in turned fueled a silent coup against the Gao Republic from the Gao Minister of Protection Arlo Casille. The presence of the UNSC also disrupted trade in the nearby Orso system.[3]


Main article: Battle of Gao


The official government of Gao was the Gao Republic.[4][5]


The military actions of Gao and her Republic appear to have been given to two different ministries: the Gao Ministry of Protection[6] and the Gao Ministry of War.[7]

Physical Aspects[]


  • Founder’s District
    • Rinale
      • People’s Palace
  • Campos Wilderness District
    • Wendosa
      • Hotel Wendosa
    • Montero Vitality Center
    • Montero Cave System
    • Montero Jungle
    • Vermillion River


  1. Halo: Last Light - Chapter 1, Page 1 (Digital)
  2. Halo: Last Light, Page 262 (Digital)
  3. Halo: Last Light, Page 5-67
  4. Halo: Last Light - Chapter 23, Page 316 (Digital)
  5. Halo: Retribution - Chapter 1, Page ??
  6. Halo: Last Light - Chapter 21, Page 264 (Digital)
  7. Halo: Last Light, Page 375 (Digital)