Castros of Larouco Nature · Larouco, Valdeorras, Ourense The municipality, of barely 23.69 square kilometres, preserves three pre-Roman fortified settlements, O Castro, O Castrillón and Castro Cabanelas, in a territory that the Roman road of the Vía Nova would later cross. Photo: Larouc01 (CC BY-SA 4.0) What to see and do in Larouco