|There is more information available on this subject at Ohio on the English Wikipedia.|
One of the cites in Ohio is Cleveland, the site of the Battle of Cleveland. During the Battle of Earth, Colonel James Ackerson claimed that an imaginary artifact known as the Key of Osanalan was located under Cleveland, hoping the Covenant would spare it, as his brother Ruwan lived there.
List of appearances
- Halo: Uprising (First appearance)