The Mandeo as it passes through O Chelo Nature · Coirós, Betanzos, A Coruña Image of Coirós, not of the place itself. A river spot where the Mandeo alternates pools, rapids and old mills beneath a dense alder wood. It is one of the best preserved stretches of the river that gives its name to the Mariñas Coruñesas e Terras do Mandeo biosphere reserve. Photo: José Antonio Gil Martínez (CC BY 2.0) What to see and do in Coirós