Question

which river basin is located in the
South Western part of Brazil which
forms the catchment of River Plata
in Argentina?​

Answer 1

Answer:

Paraná River is the answer of your question

Paraná River Rio Paraná, Río Paraná

Paraná River Rio Paraná, Río ParanáMap of the Rio de la Plata Basin showing the Paraná River and its major tributaries

I hope my Answer help you