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River Suck
River Suck, Athleague
Native name An tSuca
Country Ireland
Physical characteristics
Main source Lough O'Flynn, County Roscommon
72 metres (236 ft)
River mouth River Shannon
Shannonbridge, County Offaly
Length 133 kilometres (83 mi)
Basin features
Basin size 1,600 square kilometres (620 sq mi)
  • Right:
    Smalghrean River, Linbaun River, Shiven River

The River Suck (Irish: An tSuca) is a river within the Shannon River Basin in Ireland, 133 km (82.5 mi) in length. It is the main tributary of the River Shannon. It meets the Shannon a kilometre south of the village of Shannonbridge.


The river's name is derived from the Irish suca, of uncertain meaning, possibly deriving from succín, Middle Irish for "amber." Edmund Hogan's Onomasticon Goedelicum records the spellings suġ (sugh), suggesting connections to Old Irish súg ("juice, sap").


The River Suck drains an area of 1,599 square kilometres (617 sq mi). It forms much of the border between County Roscommon and County Galway, flowing along the western side of County Roscommon. Together with the Shannon on the east, it creates the long narrow form of southern County Roscommon.

The river rises in hills on the border of County Mayo and County Roscommon, and passes from Lough O'Flynn in a general south and south-easterly direction. Settlements along the river include Athleague, Ballinasloe, Ballyforan, Ballymoe, Castlerea, Glinsk, and Tulrush, and it flows into the River Shannon a kilometre south of the village of Shannonbridge.


The water is clean and unpolluted and the river flows through unspoilt countryside with moorland, water meadows and pastureland. Some stretches are fast-flowing while others are slow and meandering. There are abundant bream, rudd and tench in some parts, and perch and pike are also plentiful. To prevent flooding at Ballinasloe, a weir was erected in 1885 immediately above the four-arch bridge, with draw-doors which can be raised when there is an approaching flood.

Suck Valley Way

The Suck Valley Way is a long-distance trail. It is a 105-kilometre (65-mile) long circular route that begins and ends in Castlerea, County Roscommon. It is designated as a National Waymarked Trail by the National Trails Office of the Irish Sports Council and is managed by Roscommon County Council, Roscommon Integrated Development Company and the Suck Valley Committee.

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