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The Paraná - meaning 'as big as a sea' in Tupi - is the second largest river in South America and thirteenth largest river in the world. It flows from north to south from its source in southern Brazil to its mouth near Tigre, Argentina. The Paraná River stretches 2,570 km (1,600 miles) and traverses 3 South American countries - Brazil, Paraguay and Argentina - en route to the Atlantic. But before the Paraná River reaches the ocean two neat things happen. It merges with the Uruguay River to form the Rio de la Plata, the second largest estuary in the world. At its mouth, the Paraná splits into many branches creating a large triangular landform called the Paraná Delta.