Parque Ecológico de Plaiaundi Nature · Irun, Bidasoa Beherea / Bajo Bidasoa, Gipuzkoa Image of Irun, not of the place itself. 24-hectare wetland reclaimed in the marshes of the Bidasoa estuary, a refuge for a large number of migratory bird species. Photo: Vasconium (CC BY-SA 2.0) What to see and do in Irun