The Riachuelo, also known as the Matanza-Riachuelo, winds through the southern edge of Buenos Aires before emptying into the Río de la Plata. Once one of the most polluted urban waterways in South America, this river has undergone a remarkable environmental transformation through extensive cleanup and remediation efforts led by Acumar (Autoridad de Cuenca Matanza-Riachuelo). Today, the river's banks are lined with spontaneous indigenous vegetation, water plants, and marshes that continue to naturally filter and cleanse the water — a process known as phytoremediation. Where abandoned ships, sunken cars, and industrial waste once defined the landscape, anglers and visitors now encounter a recovering riparian ecosystem complete with water birds, coypuses, turtles, and visible fish. The stretch from the Acumar quay near the old Bosch Bridge down to the confluence with the Río de la Plata represents the most accessible and navigable portion of the river for those looking to explore it by boat.