Mare Erythraeum

Mare Erythraeum is a region on Mars. It 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 late 2552, it was the site of the a battle where UNSC Army forces commanded by Colonel James Ackerson fought against the land forces of the Covenant Fleet of Furious Redemption. It is unknown whether the UNSC or Covenant won the battle, but James Ackerson of the UNSC Army was taken prisoner by the Jiralahane forces.