Aller (Caudal)

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°W / 43.20000; -5.78333Coordinates: 43°12′0″N 5°47′0″W / 43.20000°N 5.78333°W / 43.20000; -5.78333
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.