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Course of River Shannon

The River Shannon (Abha na Sionainne / an tSionainn / an tSionna) is the longest river in Ireland at 360.5 km (224 miles). The river flows generally southward from County Cavan before turning west and emptying into the Atlantic Ocean through the 113 km (70 mi) long Shannon Estuary. The river develops into three lakes along its course, Lough Allen, Lough Ree and Lough Derg.