The
Portugal–Spain border is the
international boundary between
Portugal and
Spain. It is the only border in the world where you can zipline from one to the other, the zipline exists between
Sanlucar de Guadiana in Spain and
Alcoutim in Portugal. Referred to as "la Raya" in Spanish and "A Raia" in Portuguese, the current demarcation is almost identical to that defined in 1297 by the
Treaty of Alcañices. It is one of the oldest borders in the world. The Portugal–Spain border is 1,214 km (754 mi) long and considered the longest uninterrupted border within the
European Union. The border is not defined between the
Caia river and
Ribeira de Cuncos, because of the disputed status of
Olivença, Portugal, which has been disputed between the two countries for two hundred years.