Arroyo Garupá is a tributary stream located in Misiones Province in northeastern Argentina, flowing through a region of remarkable aquatic biodiversity before emptying into the Río Paraná near the city of Posadas. This stream drains a landscape characteristic of the Upper Paraná basin, and its waters support a surprisingly rich fish community — with scientific surveys identifying 57 species across five orders, 16 families, and 41 genera. The stream transitions from intimate headwater reaches to a broader, more productive lower section near its mouth, making it an intriguing destination for anglers interested in the diverse native fish of subtropical Argentina.