| Aille River | |
| Name Etymology: | Irish for "cliff river" |
| Pushpin Map: | Ireland |
| Length: | 29.8km (18.5miles) |
| Discharge1 Avg: | 15m3/s |
| Source1 Location: | Glenmask, Partry Mountains, County Mayo |
| Mouth Location: | Galway Bay via Lough Mask, Lough Corrib and River Corrib |
| Mouth Coordinates: | 53.7767°N -9.3727°W |
The Aille River (Irish: Abhainn na hAille[1]) is a river in County Mayo, Ireland, flowing from the Partry Mountains to Lough Mask, and flows underground for part of its course.[2]
The Aille River rises in the Partry Mountains 16km (10miles) south of Westport,[3] drains the northwest part of the Partry range and sinks underground at the Aille Caves. It continues as a subterranean river for 4km (02miles), resurging at Pollatoomary. It flows south to Cloon Lough, which feeds into Lough Mask.