Campo Maior is a municipality in the Portalegre District, Alentejo Region, Portugal. The population in 2011 was 8,456, in an area of 247.20 square kilometres (95.44 sq mi). It is bordered by Spain on the North and East, by Elvas Municipality on the Southeast, and by Arronches Municipality on the West.

Elvas is a Portuguese municipality, former episcopal city and frontier fortress of easternmost central Portugal, located in the district of Portalegre in Alentejo. It is situated about 200 kilometres (120 mi) east of Lisbon, and about 8 kilometres (5.0 mi) west of the Spanish fortress of Badajoz, by the Madrid-Badajoz-Lisbon railway. The municipality population as of 2011 was 23,078, in an area of 631.29 square kilometres (243.74 sq mi). The city itself had a population of 16,640 as of 2011.