noun
- Rí·o de la [ree-aw th e lah] /ˈri ɔ ðɛ lɑ/, an estuary on the SE coast of South America between Argentina and Uruguay, formed by the Uruguay and Paraná rivers, about 185 miles (290 km) long.
noun
- Río de la Plata (ˈrio de la) an estuary on the SE coast of South America, between Argentina and Uruguay, formed by the Uruguay and Paraná Rivers. Length: 275 km (171 miles). Width: (at its mouth) 225 km (140 miles)Also known as: La Plata English name: River Plate