We crossed the Rio de la Plata river today. It took us 1 hour on a fast ferry to get across! You can see pictures below from satellite and with a map. At the mouth it is 140 miles across. There are debates about whether it is a properly a river or a sea inlet. The basin is influenced by the ocean tides, but the flow of the river is so strong that the water is freshwater, with some salty currents (the salt water tends to sink below the fresh water).
You can't tell from this picture, but you can see the tallest buildings in Buenos Aires on the horizon. I think the distance is about 40 miles, but I'm not sure.
Buenos Aires is sprawled on the lower right side of the image in tannish shades. We went almost straight across to Colonia which you can pick out with the small islands near the smaller mouth of the river. Can you imagine how much sediment it takes to make this whole area so brown? (and the water is quite brown). The length is about 180 miles long!
Montevideo is closer to the sea and about a 3 hour fast ferry ride from BA.
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