MadridMadrid (məˈdrɪd , maˈðɾið) is the capital and most populous city of Spain. The city has almost 3.4 million inhabitants and a metropolitan area population of approximately 6.7 million. It is the second-largest city in the European Union (EU), and its monocentric metropolitan area is the second-largest in the EU. The municipality covers geographical area. Madrid lies on the River Manzanares in the central part of the Iberian Peninsula.