Which Capital Lies Directly East of Buenos Aires?

Capital Cities Relative to Buenos Aires

Among the options, Montevideo (capital of Uruguay) lies directly east of Buenos Aires.

Geographic Context

• Buenos Aires – Western shore of the Río de la Plata estuary.
• Montevideo – Eastern shore of the same estuary, ~200 km east-northeast.
• Santiago (Chile) – West, across the Andes.
• Lima (Peru) – Far northwest, on Pacific coast.
• Brasília (Brazil) – Far north, inland.

Montevideo and Buenos Aires are the closest national capitals in the world (after Vatican City/Rome), separated only by the Río de la Plata.