Mare Erythraeum
From Halopedia, the Halo wiki
Mare Erythraeum is a very large dark dusky region of Mars that can be viewed by even a small telescope. The name comes from the Latin for the Arabian Sea, because it was originally thought to be a large sea of liquid water. It was included in Percival Lowell's 1895 map of Mars.
in 2552, it was the site of the Battle of Mare Erythraeum, A battle where James Ackerson and his soldiers fought against the Covenant Fleet of Furious Redemption. [1]
