Estuary of the Paraná and Uruguay rivers, between Uruguay and Argentina.
It is about 180 mi (290 km) long, with a maximum width of 136 mi (219 km) at its mouth, but it narrows gradually to the northwest as it approaches Buenos Aires. Discovered by the Spanish in 1516, it was explored by Ferdinand Magellan in 1520 and by Sebastian Cabot (1526–29). The first permanent settlement in the area was at Asunción in 1537.
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