Potomac River

The Potomac River is a location that appears in Sonic X comic series published by Archie Comics. It is a river located in Washington, D.C.

Archie Comics
When Dr. Eggman found out about an alleged Chaos Emerald at Smithsonian Institute, he hid in the Potomac River with one of his robots, where he ordered the Rogue Rouge to retrieve the Emerald for him.