Arcadia is a terrestrial planet in the Alpha Canis Minoris System that was colonized by humanity in 2429. The planet was found to have no need for terraforming, as it was already inhabited by dense jungles and large oceans which led to it's establishment as a resort world. The Forerunners maintained a presence on Arcadia and left behind ruins which contained the coordinates to Shield 0459. In 2531, the Covenant invaded this planet after being led by a Forerunner interstellar map on Harvest.
Spartan Red Team was able to defend the evacuation centers and drive the Covenant ground forces back. Although the Covenant extracted the coordinates to Shield 0459, the colonists were able to evacuate with little distraction and the planet would survive intact and habitable. Nature would reclaim most of the cities, and the remaining colonists would establish their own farm settlements around the jungles and continue to supply food to the UNSC. In 2549, the Covenant would return and glass the remaining settlements. BXR Mining Corporation would establish seven facilities dedicated to chipping away the glass and repair the planet.