This capital's executive branch governs from the Casa Rosada.
One old section of this city is San Telmo, and another section of this city contains Caminito Street and is a Europeanized borough called La Boca. This city is bounded on the west by the Riachuelo River and a popular beach town close to this city is Mar del Plata. Landmarks in this city include the world's widest street, the Avenida Nueve de Julio, which contains a large obelisk in the middle. This capital's executive branch governs from the Casa Rosada. Located across the Rio de la Plata from Montevideo, for 10 points, identify this capital and largest city of Argentina.
One old section of this city is San Telmo, and another section of this city contains Caminito Street and is a Europeanized borough called La Boca.
{Buenos Aires}