Arroyo Ludueña is a stream winding through the Santa Fe province of Argentina, draining into the broader Paraná river system that defines this region's rich aquatic character. Situated near the coordinates 32°54′S, 60°40′W, this waterway flows through the lowland floodplain landscape typical of the Pampa húmeda, where slow-moving, warm waters support a diverse community of native South American fish species. The stream is part of a network of arroyos and riachos that connect to larger waterways including the Río Coronda and Arroyo Saladillo, making it an accessible and productive destination for anglers targeting iconic Neotropical species.