The Guadiana International Bridge (Spanish: Puente Internacional; Portuguese: Ponte Internacional) is a bridge that crosses the Guadiana River connecting southern Spain (town of Ayamonte) and Portugal (town of Castro Marim). It is the southernmost land crossing between Portugal and Spain. It is not split evenly between the two countries, a greater share of it situated in Portugal. Completed in 1991, its structural type is a cable-stayed bridge, with a deck of prestressed concrete. The bridge was designed by the Portuguese Structural Engineer Professor José Luis Câncio Martins on behalf of Huarte S.A. (now Obrascón Huarte Lain) and Teixeira Duarte. The bridge is open to vehicles only.