Portugal–Spain border the border exists between Sanlucar de Guadiana in Spain and Alcoutim in Portugal; it is the first and currently only zip line over an international border. Portugal–Spain border The Portugal–Spain border is the international boundary between Portugal and Spain. Referred to as "la Raya" in Spanish and "A Raia" in Portuguese (the stripe), 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 miles) long and considered the longest uninterrupted border within the European Union. The border
Lithuania–Poland border Lithuania–Poland border The current Lithuania–Poland border exists since the re-establishment of the independence of Lithuania on March 11, 1990. Until then the identical border was between Poland and Lithuanian SSR of the Soviet Union. The length of the border is . It runs from the Lithuania–Poland–Russia tripoint southeast to the Belarus–Lithuania–Poland tripoint. It is the only land border that the EU- and NATO-member Baltic states share with a country that is not a member of the Russian-aligned Commonwealth of Independent States. To the military planners of NATO, the border area is known as the Suwalki gap (named after the nearby