the Antípodas of Formosa Argentina is Taiwan,
I hope that to receive a postcard from the farthest distance,
that is 19,961km,
in case of you dwell in Formosa Argentina, you may do it for me,
because of COVID-19, Taiwan postal service has been suspended,
after COVID-19, you may continue,
I think in this section you should translate your message to Spanish. But answering your question, most people here are from Spain, I doubt you are going ti find someone from Formosa. Your best bet is to try contacting people from Argentina directly.