Rio de la Plata is a large estuary in South America, located between Argentina and Uruguay. It is formed by the confluence of the Paraná and Uruguay rivers. The name 'Rio de la Plata' translates to 'River of Silver' in Spanish. It is the widest river in the world, with a width of up to 220 kilometers. The Rio de la Plata is an important source of fish and other marine life, and is also used for transportation and recreation.