Argentina is a Spanish-speaking country located in South America, with a population of around 40 million people. Spanish is the official language, and Buenos Aires is the capital city. Football is the most popular sport in Argentina, which won the World Cup in 1978, and famous footballers include Diego Maradona, Lionel Messi, and Pablo Aimar. The climate varies regionally, from subtropical in the north to damp and cold in the south.