The Tay is the longest river in Scotland, stretching a distance of 120 miles (193 km) from the northern slopes of Ben Lui to the Firth of Tay beyond Perth.
It rises as the Fillan at the western end of Breadalbane, and flows south-eastwards through Strath Fillan to become the Dochart at Crianlarich.
From there it continues eastwards through Loch Dochart and Loch Iubhair in Glen Dochsrt to join Loch Tay at Killin. Issuing from the eastern end of Loch Tay, the River Tay proper flows east and south-east passed the settlements of Kenmore, Aberfeldy, Dunkeld and Perth before emptying into the Firth of Tay near its junction with the River Earn. It has the largest catchment of any Scottish river, some 2,400 sq. miles (6,216 sq. km).