The River Farg is a small tributary of the River Earn, located in the lieutenancy area of Perth and Kinross, central Scotland.
Its source is located in Glen Farg reservoir; it winds round roads and farms, and has been forced in many places to change course due to human interference.
The name Farg may represent an Old Gaelic adaption of Brittonic *wergā, meaning "anger" (c.f.
The river was polluted with aluminium sulphate killing nearly all of the fish in May 2014.
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