| Aller | |
| Ayer | |
| River | |
|
The Aller river in Bustiello
|
|
| Country | Spain |
|---|---|
| State | Asturias |
| Source | Cantabrian Mountains |
| Mouth | Caudal |
| - location | near Ujo, Asturias, Spain |
| - coordinates | 43°12′0″N 5°47′0″W / 43.20000°N 5.78333°WCoordinates: 43°12′0″N 5°47′0″W / 43.20000°N 5.78333°W |
| Length | 42 km (26 mi) |
| Basin | 280 km2 (108 sq mi) |
The Aller is a river in northern Spain flowing through the Autonomous Community of Asturias.