Anexión y restitución municipal de Berriatua Historical milestone · Berriatua, Lea-Artibai / Markina-Ondarroa, Bizkaia Image of Berriatua, not of the place itself. The town of Ondárroa was founded in 1335 on land belonging to the anteiglesia of Berriatua. Centuries later, between 1969 and 1983, Berriatua was administratively annexed to Ondárroa until a legal process restored its municipal independence in 1983. Photo: Lander Eizagirre (CC BY-SA 3.0) What to see and do in Berriatua