Suck (river)
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Suck An tSuca  | 
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 The River Suck at Athleague , County Roscommon  | 
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| Data | ||
| location | Galway and Roscommon Counties , Republic of Ireland | |
| River system | Shannon | |
| Drain over | Shannon → Atlantic | |
| source | Lough O'Flynn outflow  53 ° 46 ′ 12 ″ N , 8 ° 37 ′ 39 ″ W.  | 
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| muzzle | at Shannonbridge in the Shannon coordinates: 53 ° 16 '23 "  N , 8 ° 3' 18"  W 53 ° 16 '23 "  N , 8 ° 3' 18"  W 
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| length | 85 km | |
The Suck ( Irish : An tSuca ) is a river in the Republic of Ireland and the main tributary of the Shannon .
The Suck, about 85 km long, runs between Counties Galway and Roscommon in a north-south direction and flows into the Shannon at Shannonbridge .
Ballinasloe is the largest town on the Suck.