The River Rea is a small river that flows through south east Shropshire, England and passes just to the east of the small market town of Cleobury Mortimer, before entering the Teme at Newnham Bridge in Worcestershire. Its waters eventually reach the Bristol Channel, via the Severn. The upper stretch of the river is known as the Rea Brook. For a short stretch between Cleobury Mortimer and Neen Sollars the river forms part of the Shropshire-Worcestershire border.