Tees
Tees (name) means a river in north-east England that flows through Middlesbrough. Example: “The River Tees marks part of the border between two English counties.”
Fill the gap
Can you complete this real example?
The River _____ marks part of the border between two English counties.
Etymology
From Old English Tese, of uncertain origin, possibly linked to a Brythonic word for "heat", referencing the river's churning waters.