Gorges of the Aller river Nature · Aller, Caudal, Asturias Image of Aller, not of the place itself. The river Aller has carved in the mountain limestone a succession of deep, shadowy gorges that narrow the valley; together with the foces of the river Pino they make up the most abrupt and deeply cut river landscape in the whole concejo. Photo: LBM1948 (CC BY-SA 4.0) What to see and do in Aller