query: What language is spoken in Buenos Aires?
passage: Languages of Argentina
At least 40 spoken languages are spoken in Argentina. They include indigenous and immigrant languages, with Spanish being dominant. Some are endangered, spoken by elderly people whose descendants do not speak the languages.[2] There is evidence of some now extinct languages.
passage: Buenos Aires
The city of Buenos Aires lies in the pampa region, except for some zones like the Buenos Aires Ecological Reserve, the Boca Juniors (football) Club "sports city", Jorge Newbery Airport, the Puerto Madero neighborhood and the main port itself; these were all built on reclaimed land along the coasts of the Rio de la Plata (the world's widest river).[36][37][38]