The River Ilen (Irish: An Aighlinn)[1] is a river in West Cork, Ireland. It rises at Mullaghmesha mountain and flows southwards for 37 kilometres into the Celtic Sea.

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Its five main tributaries are, the Saivnose, Coarliss, Achrinduff, Glounaphuca and Clodagh. It is listed as having Quality A water, which means its pollution levels are far below the national average. Fish found in the river include brown and sea trout and Atlantic salmon.[2] The main settlement on the river is Skibbereen. It flows into the sea at the village of Baltimore.

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