Flatlands of Iroite Curiosity · Boiro, Barbanza, A Coruña Image of Boiro, not of the place itself. A plateau of the sierra de O Barbanza with one of the greatest concentrations of mámoas in Galicia, burial tumuli raised between 4500 and 2800 BC and today crossed by a waymarked megalithic route. Photo: Certo Xornal (CC BY 2.0) What to see and do in Boiro