The River Brosna rises in Lough Owel and is a tributary of the river Shannon.
Fun fact about River Brosna:
- The Brosna begins as a small river, flowing from Lough Owel, flows through Mullingar into Lough Ennell.
- From Lough Ennell, the river Brosna flows into Killbeggan, were still to this day still powers the mill at Killbeggan Distillery.
The River Brosna is a well known location for fly fishing, Salmon and Brown Trout