Buenos Aires lies on the western shore of which massive estuary, shared with Uruguay?
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The Río de la Plata is the widest river estuary in the world, stretching about 220 kilometers at its mouth. It is formed by the confluence of the Uruguay and Paraná rivers. Its distinct muddy brown color comes from the massive amount of sediment carried downstream. Photo: Earth Sciences and Image Analysis Laboratory, NASA Johnson Space Center, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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