River Ilen

River Ilen
Physical characteristics
Source
• location	Mullaghmesha, Cork
• elevation	494 m (1,621 ft)
Mouth
• location	Celtic Sea at Spanish Island
Length	34 km (21 mi)
Basin size	301.7 km2 (116.5 sq mi)

The River Ilen is a river in West Cork, Ireland. It rises at Mullaghmesha mountain and flows southwards for 34 kilometres into the Celtic Sea.

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. The main settlement on the river is Skibbereen.