The Cornwall River is a river located in the south-west of England. It is formed by the confluence of the Tamar and the Inny rivers, both of which are five and four letters respectively. The Tamar rises in Dartmoor and flows south to Plymouth, while the Inny rises in Exmoor and flows south-east to join the Tamar near Launceston. Together, they form the Cornwall River, which flows south-west to the English Channel.