Chelo natural area Nature · Coirós, Betanzos, A Coruña Image of Coirós, not of the place itself. A stretch of the Mandeo in the A Espenuca valley declared a picturesque site by decree 2646/1972; it preserves fourteen mills among alders, ash trees and birches, and is one of the few rivers where salmon, trout and eel live side by side. Photo: José Antonio Gil Martínez (CC BY 2.0) What to see and do in Coirós