Mount Erebus

Mount Erebus is a geographical location in Ross Island, Antarctica on Earth. Its height is around 12,500 feet. Erebus is the southernmost active volcano on Earth.

Background
Mount Erebus is currently the most active volcano in Antarctica. The summit contains a persistent convecting phonolitic lava lake, one of a very few long-lived lava lakes in the world. Characteristic eruptive activity consists of Strombolian eruptions from the lava lake or from one of several subsidiary vents, all lying within the volcano's inner crater.

Second Battle of Earth
During the Second Battle of Earth, three SPARTAN-IIs (Fred, Linda, and Will) had a mission there to stop a Covenant attack.