By some definitions, this body is the widest river in the world, and it receives the delta of the Parana River.
This body of water is home to a distinctive species of dolphin, which has the longest beak of any cetacean and is nicknamed the Franciscana. It's not in Brazil, but at one end of this body of water you can find Sugar Loaf Hill. Less-famous cities on this body of water include Quilmes and Maldonado. The brackish Samborombon Bay is found where this body of water receives the Salado River. A sandbar called the "Sandbar of the Indian" separates this body's freshwater and saltwater areas. Neighborhoods on this body of water include La Boca. By some definitions, this body is the widest river in the world, and it receives the delta of the Parana River. For 10 points, name this massive estuary of South America, found near Buenos Aires between Argentina and Uruguay.
This body of water is home to a distinctive species of dolphin, which has the longest beak of any cetacean and is nicknamed the Franciscana.
Rio de la Plata [or River Plate; prompt on "Parana" or "Uruguay" until mentioned]