Seville Spain, Andalucia Capitol. The City of Seville (Seviilla) is the capital city of the province of Sevilla and also the capitol of Andalucía .The city is located on the banks of the Guadalquivir River in the southwest of the Spain, in the heart of the Andalucia. It is the fourth largest city in Spain with a population of over 704,000 in the metropolitan area but the whole urban area plus the satellite towns is over 1,317,000.