Spain is the only country that shares a land border with Portugal, and both countries belong to the Iberian Peninsula. They also have a long history of interaction, rivalry, and cooperation.
Andorra is a small landlocked country on the Iberian Peninsula, between Spain and France. It has a Catalan culture and language, and was once a part of the Crown of Aragon, which also ruled parts of Portugal.
France is a neighboring country of Spain, and has a historical and cultural influence on Portugal. The two countries share a Latin heritage, and have been allies since the 14th century. France also helped Portugal during the Napoleonic Wars and the Peninsular War.
Brazil is the largest and most populous former colony of Portugal, and the only Portuguese-speaking country in South America. The two countries share a close linguistic, cultural, and economic bond, and are part of the Community of Portuguese Language Countries.
Angola is another former colony of Portugal, and the second-largest Portuguese-speaking country in the world. The two countries have a complex and sometimes tense relationship, marked by the Angolan War of Independence and the Angolan Civil War.