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Río de la Plata river is the estuary made of the confluence of Rivers Parana & Uruguay; when most rivers of its length have large deltas (Nile, Amazon, Mississippi, Yangtze). In fact Parana has a delta before the water empties in to Río de la Plata. Perhaps it has the broadest and deepest estuary as a result of some geological fault. Some term it as 'Gulf' about 180 km long and 80 km at its widest. Not only that it further widens beyond Montevideo, the capital of Uruguay. A salt wedge forms landward (into the river upstream). After Amazon (175,000 Cubic meters/s), (39,000)& Yangtze(32,190), it has the largest discharge rate (22,900).

The rivers carry 57,000,000 cubic metres (2.0×109 cu ft) of silt into the Río de la Plata each year; where the muddy waters are stirred up by winds and tides.

For example is it sandy, silicate based, silty, muddy, rocky? if its sandy or gravely, what would be the aproximate grain size of the sand / gravel?

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