evidence: Olivenza (Spanish: [oliˈβenθa] ) or Olivença (Portuguese: [oliˈvẽsɐ]) is a town in southwestern Spain, close to the Portugal–Spain border. It is a municipality belonging to the province of Badajoz, and to the wider autonomous community of Extremadura. [...] Geography [edit]Olivenza is located on the left (east) bank of the Guadiana river,[6] at an equal distance of 24 kilometres (15 miles) south of Elvas in Portugal and Badajoz in Spain. The territory is triangular, with a smaller side resting on the Guadiana and the opposite vertex entering south-east and surrounded by Spanish territory. Besides the city, the municipality of Olivenza also includes other minor villages: San Francisco (Portuguese: São Francisco), San Rafael (São Rafael), Villarreal (Vila Real), Santo Domingo de Guzman (São Domingos de Gusmão), San Benito de la Contienda (São Bento da Contenda), and San Jorge de Alor (São Jorge da Lor). [...] Spain claims ‘de jure’ sovereignty over Olivenza on the grounds that the Treaty of Badajoz still stands and has never been revoked, thus making the case that the border between the two countries in the region of Olivenza should be demarcated as said by the treaty.