The River Isla is a scenic tributary of the River Tay flowing through the Vale of Strathmore in Scotland, offering anglers a rewarding experience on a classic Scottish lowland river. Managed extensively by the Strathmore Angling Improvement Association (SAIA), the Isla and its tributaries — Dean Water and Kerbet Water — provide approximately 11 miles of quality fly fishing water in a picturesque agricultural valley setting. The river has been a focal point for local angling since SAIA's formation in 1948, with a mission to promote accessible brown trout and grayling fishing at prices affordable to anglers of all ages.