The River Shannon is part of the Waterways of Ireland and is made up of the River Shannon - Killaloe to the sea, the River Shannon - Lough Derg, the River Shannon - Portumna to Athlone, the River Shannon - Lough Ree, the River Shannon - Lanesborough to Jamestown, the River Shannon - Lough Allen Canal, the River Shannon - Jamestown to Battlebridge, the River Shannon - Jamestown Canal, the River Shannon - Lough Allen and the River Shannon - Boyle River.
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Wikipedia has a page about River Shannon
The River Shannon (Irish: Abha na Sionainne / an tSionainn / an tSionna) is the longest river in Ireland at 360.5 km (224 miles).
The River Shannon drains the Shannon River Basin which has an area of 16,865 km2 (6,512 ml2), one fifth of the area of Ireland.
It divides the west of Ireland (principally the province of Connacht) from the east and south (Leinster and most of Munster). County Clare, being west of the Shannon but part of the province of Munster, is the major exception. The river represents a major physical barrier between east and west, with fewer than thirty crossing-points between Limerick city in the south and the village of Dowra in the north.
The river is named after Sionna, a Celtic goddess.
The Shannon has been an important waterway since antiquity, having first been mapped by the Graeco-Egyptian geographer Ptolemy. The river flows generally southward from the Shannon Pot in County Cavan before turning west and emptying into the Atlantic Ocean through the 102.1 km (63.4 mi) long Shannon Estuary. Limerick city stands at the point where the river water meets the sea water of the estuary. The Shannon is tidal east of Limerick as far as the base of the Ardnacrusha dam.