The Aller is a river in northern Spain flowing through the Autonomous Community of Asturias.
| Aller Ayer | |
|---|---|
 The Aller river in Bustiello | |
 | |
| Location | |
| Country | Spain |
| State | Asturias |
| Physical characteristics | |
| Source | Cantabrian Mountains |
| Mouth | Caudal |
• location | near Ujo, Asturias, Spain |
• coordinates | 43°12′0″N 5°47′0″W / 43.20000°N 5.78333°W |
| Length | 42 km (26 mi) |
| Basin size | 280 km2 (110 sq mi) |
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