evidence: Olivenza – The Spanish-Portuguese border town with a shared history and heritage [...] Olivenza (Spanish) or Olivença (Portuguese) is a town located in southwestern Spain, near the Portuguese border, on a historically disputed section of the Portugal–Spain border. [...] Spain has since administered the territory (now split into two municipalities, Olivenza and also Táliga), whilst Portugal invokes the self-revocation of the Treaty of Badajoz, plus the Treaty of Vienna of 1815, to claim the return of the territory.