On Oct 31, 8:53*am, Martin Edwards wrote:

For most of the 19th century the capital of the River Plate states was known
to the English as Buenos Ayres.

Mar del Plata

I'm not sure what you are saying here.

AFAIK Mar del Plata was not a capital of anything. There was nothing
there until 1874, and had no port until 1916. It may now be
Argentinas' 7th largest city and exceeds half a million population,
but in the 19th century it was nothing.

Or are you answetring something further up thread,

How would one describe Buenos Aires... Rio de Janeiro... en Ingles?


Are you perhaps confusing things with Rio de la Plata ? Not only
location but translation: rio is river, mar is sea.

--
Nick