of the UN principles of decolonisation, territorial integrity and that Spanish arguments for the recovery of Gibraltar substantiate Morocco's claim. With Portugal Olivenza (Spanish) or Olivença (Portuguese) is a town and seat of a municipality, on a disputed section of the border between Portugal and Spain, which is claimed de jure by both countries and administered de facto as part of the Spanish autonomous community of Extremadura. The population is 80% ethnic Portuguese and 30% of Portuguese language. Olivenza/Olivença was under continuous Portuguese sovereignty since 1297 until it was occupied by the Spanish in 1801 and formally ceded by Portugal later that year by the Treaty of Badajoz. Spain claims the de jure (legal) sovereignty over Olivenza/Olivença on the grounds that the Treaty of Badajoz still stands and has never been revoked. Thus, the border between the two countries in the region of Olivenza/Olivença should be as demarcated by that treaty. Portugal claims the de jure sovereignty over Olivenza/Olivença on the grounds that the Treaty of Badajoz was revoked by its own terms (the breach of any of its articles would lead to its cancellation) when Spain invaded Portugal in the Peninsular War of 1807. Portugal further bases its case on Article 105 of the Treaty of Vienna of 1815, which Spain signed in 1817, that states that the winning countries are to "endeavour with the mightiest conciliatory effort to return Olivenza/Olivença to Portuguese authority". Thus, the border between the two countries in the region of Olivenza/Olivença should be as demarcated by the Treaty of Alcanizes of 1297. Spain interprets Article 105 as not being mandatory on demanding Spain to return Olivenza/Olivença to Portugal, thus not revoking the Treaty of Badajoz. Portugal has never made a formal claim to the territory after the Treaty of Vienna, but has equally never directly acknowledged the Spanish sovereignty over Olivenza/Olivença. Portugal continues to claim Olivenza/Olivença, asserting that under the Vienna Treaty of 1815, Spain recognized the Portuguese claims as "legitimate". The historic disputes with Portugal over the Savage Islands in the Atlantic Ocean were resolved in recent times. Bilateral relations Africa Americas Asia Europe Oceania See also History of Spain Peninsular War (1807–1814), Napoleon versus Great Britain Spanish American wars of independence History of Spain (1810–1873) Spain during World War I France–Spain relations History of French foreign relations Italy–Spain relations Portugal–Spain relations Russia–Spain relations Spain–Turkey relations Spain–United Kingdom relations History of the foreign