Basque Eurocity Bayonne-San Sebastián

The Eurociudad Vasca Bayonne-San Sebastián (French: Eurocité basque Bayonne-Saint-Sébastien; Basque: Baiona-Donostia Euskal Eurohiria) is the name given to the urban cross-border region located between Spain and France along the coast of the Cantabrian Sea in the Bay of Biscay.

Given the progressive European integration and the disappearance of internal borders in the European Union, as of 1993 various local institutions on both sides of the border created cross-border cooperation agreements that have led to the creation of a cross-border city project that brings together 42 local entities, both Spanish and French. This project covers the realization of common projects (synergies in the tourism sector, freight transport, use of common infrastructures, etc.). The consortium that directs the eurocity project has the legal entity of a European economic interest group (Groupement européen d'intérêt économique). In the future it could become a eurodistrict.

The project is based on the existence of a real urban region that crosses the border, on the existence of synergies and complementarities between both sides of the border and on the existence of a common Basque cultural base. The three official languages of the institution are Spanish, French and Basque.