I notice that there are ferries just between Buenos Aires or Tigre on the Argentine side and Montevideo or Colonia or Carmelo on the Uruguayan side. At some point in the past, did anyone ever try to set up a ferry between either Magdalena or Punta Indio or San Clemente del Tuyu or Villa Gesell or Mar del Plata (something like that along the BsAs Prov. coast south of Buenos Aires) and Montevideo or elsewhere in Uruguay, where the Rio de la Plata is wider and meets the Atlantic Ocean? (I'm thinking of the extensive ferry networks in Western Europe and in some parts of North America.)