Arcterra is a planet in the Tetra Galaxy settled on by the Alimbics. It has a very cold climate, but is still able to support life. The area explored by Samus is filled with the ruins of the Alimbic Civilization. Arcterra is filled with creatures that are native to cold climates, such as the Arctic Spawn. There are two Octoliths hidden on the planet. Samus can land on Arcterra after obtaining the first Octolith on Alinos.