The Riachuelo is a river in Argentina, flowing through the Buenos Aires province. It is approximately 64 kilometers long and is known for its historical significance and industrial importance. The river eventually empties into the Rio de la Plata, which is one of the largest estuaries in the world. The Riachuelo has faced significant pollution issues over the years, primarily due to industrial waste and urban runoff. Efforts have been made to clean and restore the river, as it plays a crucial role in the local ecosystem and the communities surrounding it.