River Isla, Perthshire

The River Isla (Uisge Ìl) is a tributary of the River Tay in Angus and Perthshire, Scotland. It rises in the Grampians before flowing down through Glen Isla into the Valley of Strathmore. After a course of 46 miles (74 km), it falls into the Tay near Meikleour. Its tributaries include the Ericht.