Also known as: スペースコロニー・アーク
A large, moon-like space colony that appears in the Sonic the Hedgehog series.
Before its shutdown, weapons of mass destruction were developed in its top secret research facilities, including the Eclipse Cannon, said to be able to destroy planets when at full capacity. It is also the birthplace of Shadow The Hedgehog, 50 years prior to the events of Sonic Adventure 2.