The Henry River is a river in southern Parthenia Province. The city of Nonesuch is on the Henry. Early in the Detinan Civil War, forces loyal to King Avram assaulted Nonesuch up the Henry River. They were repulsed by the Army of Southern Parthenia.
The Henry River is based on Virginia's James River. The Southron assault described mirrors George McClellan's Peninsula Campaign in the American Civil War. The selection of the name "Henry" may be a pun on 19th century American author Henry James.