Río Guayquiraró is a river located in Entre Ríos Province, Argentina, flowing through a region renowned for its exceptional warm-water fishing. Situated within the broader Paraná River basin, this waterway offers anglers access to some of the most prized sport fish in South America. The river is part of a rich aquatic ecosystem characteristic of the subtropical lowlands of northeastern Argentina, where warm, productive waters support a diverse community of fish species. Its position in the Entre Ríos region places it among a network of rivers, arroyos, and backwaters that collectively form one of the continent's most celebrated fishing destinations.