The Río de la Plata is a large estuary located in South America, formed by the confluence of the Paraná and Uruguay rivers. It serves as a natural border between Argentina and Uruguay and is one of the widest estuaries in the world, measuring about 220 kilometers (140 miles) across at its mouth. The estuary flows into the Atlantic Ocean. The Río de la Plata is an important waterway for trade and transportation, facilitating the movement of goods to and from the interior of Argentina and Uruguay. Its rich ecosystem supports various species of fish and birds, making it a vital area for both biodiversity and local fishing industries.