Arroyo de Leyes is a significant watercourse flowing through the province of Santa Fe, Argentina. It is a primary tributary to the extensive Paraná River system, connecting to the Coronda River, which in turn flows into the Paraná. This connection places it within one of South America's most productive and biodiverse river basins. The arroyo's environment is characterized by its integration into the vast Paraná floodplain, featuring typical wetland landscapes, vegetated banks, and dynamic water levels influenced by the larger river system. It is a destination for anglers seeking diverse freshwater species in a rich, natural setting.