River Erriff

River Erriff
Aasleagh Falls on the Erriff
Native nameAbhainn na hOirimhe (Irish)
Physical characteristics
Source 
 • locationGlennacally
Mouth 
 • location
Atlantic Ocean at Killary Harbour
Length33.0 km (20.5 mi)
Basin size163 km2 (63 sq mi)
Discharge 
 • average8.16 m3/s (288 cu ft/s)

The River Erriff (Irish: Abhainn na hOirimhe) is a river in Ireland, flowing through County Mayo. A spate river, it is characterised by lively streams and deep fish-holding pools. A waterfall called Aasleagh Falls (Irish: Eas Liath, meaning 'grey waterfall') is near the mouth of the river.