Salt marshes and populations rendered before the evidence of a dream place where the summer mixes the immense light of the sun with the transparencies of waters and intense the blue one of the sky. The Reserve of the Biosphere of Urdaibai is a fluvial river basin of 22,041 hec. ends at the cantabric ocean.

Inside Urdaibai 625 plants have been identified vasculares. Also exists a varied zoological community, between which it honors the birds related to the humedals.

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