Urdaibai Biosphere Reserve (Urdaibai Reserva de la Biosfera)

Formed from the estuary at the mouth of the Basque Country’s Oka River, the Urdaibai Biosphere Reserve is a vital habitat for both migratory and resident birds. The reserve encompasses some of the region’s most popular beaches, where visitors can enjoy the natural beauty and coastal wildlife. Additionally, the area is rich in archaeological sites, including the Cave of Santimamiñe, which features ancient paintings that offer a glimpse into the region’s prehistoric past. Today, visitors can explore the diverse landscapes, observe a variety of bird species, and delve into the area’s historical and cultural heritage.