The River Earn (Scottish Gaelic: Uisge Èireann) in Scotland leaves Loch Earn at St Fillans and runs east through Strathearn, then east and south, joining the River Tay near Abernethy. The Earn is about 74 kilometres (46 mi) long. It passes by Comrie, Crieff (where it is joined by the Pow of Inchaffray) and Bridge of Earn. The river is fast flowing, with many shoals, whilst the surrounding land is generally flat and is occasionally subject to flooding.Near to the River Earn lay the ancient Strageath Roman Camp. This camp was one of a series of camps used by the Romans to construct their invasion of the north; other notable camps in this chain are Ardoch, Stracathro, Battledykes, Raedykes and Normandykes.

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