Waterfall of o Cadarnoxo Nature · Boiro, Barbanza, A Coruña The rego Lampreeira, a tributary of the río Cañoto, plunges more than thirty metres down a stepped rock face on the slope of the sierra of the Barbanza; it is among the highest waterfalls in Galicia and comes down at full strength in the rainy months. Photo: Xoan Anton (CC BY 2.0) What to see and do in Boiro