The River Doon flows 23 miles from Loch Doon, joining the Firth of Clyde just south of Ayr.
Its course is generally north-westerly, passing near to the town of Dalmellington, and through the villages of Patna, Dalrymple, and Alloway, birthplace of Robert Burns.
The source of the Doon is Loch Enoch, high in the Galloway Hills.
In the 1930s, the Loch Doon was dammed to provide water to the Galloway Hydro Electric Scheme, today operated by Scottish Power.
The Doon catchment is relatively narrow and there are few large tributaries below Loch Doon. The most significant of these are the Muck Water, Cummock Burn, Dunaskin Burn and Culroy Burn.
Common fish species include salmon, brown and sea trout, arctic charr, stone loach, eels, lampreys, pike and perch. Camera canon 7D.