Which river is the widest river in the world?

The Río de la Plata — named River Plate in British English and the Commonwealth and La Plata River (occasionally Plata River) in other English-speaking countries — is the estuary formed by the confluence of the Uruguay and the Paraná rivers. It empties into the Atlantic Ocean, forming a funnel-shaped indentation on the southeastern coastline of South America. Depending on the geographer, the Río de la Plata may be considered a river, an estuary, a gulf or a marginal sea. It is the widest river in the world, with a maximum width of 220 kilometres (140 mi).