From Halopedia, the Halo wiki
Edda was a supercontinent that covered two-thirds of Harvest. It is capped by the Hugin Sea to the north and the Munin Sea to the south. Eighty-six percent of the continent is within five hundred meters of sea level, the only major change in elevation occurring in the Bifrost, which cuts diagonally across the continent. This land is stated to be arable. The fertility of this land is what makes Harvest the great producer of agriculture. Edda was partially glassed by the Covenant's Rapid Conversion in 2525.
The name Edda comes from two Nordic poems; the Poetic Edda and the Prose Edda written in Iceland around the 13th Century.
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