Its extension and excellent conservation make Urdaibai the most important wetland in the Basque Country. It is probably where the widest variety of landscapes, flora and fauna in the whole of the Basque Autonomous Region can be found. The district has 22 municipalities and occupies 10% of the province’s surface area. At its heart is the river Oka with its source in mount Oiz. By the time it winds its way down to Mundaka Oka has becomes a broad estuary with spectacular wetlands full of life.
From the coastal cliffs and beaches to the inland forests and rivers, via the river wetlands and plains, Urdaibai offers visitors some of the most attractive and well-loved beaches in the Basque Country such as the constantly changing Laida beach or the spectacular Laga beach, right below Ogoño rock.