The River Leven (Uisge Leamhna in Gaelic) is a stretch of water in West Dunbartonshire, Scotland, flowing from Loch Lomond in the North to the River Clyde in the South. The total length of the river is approximately six miles and is very popular with salmon and sea trout anglers, trying to catch one of these migratory fish going up to Loch Lomond. Quoted from Wikipedia