Sediments in Rio de la Plata Estuary, Argentina34.6S 58.3W
The Río de la Plata is the river and estuary formed by the confluence of the Uruguay River and the Paraná River on the border between Argentina and Uruguay. It is a funnel-shaped indentation on the southeastern coastline of South America, about 290 kilometres (180 mi) long. Here, as usual, it appears tan from sediments. Sediments and some sun glint also highlight the paths of the Uruguay and Paraná Rivers as they flow towards each other at the base of the estuary.
The Río de la Plata widens from about 2 kilometres (1.2 mi) at the inner part to about 220 kilometres (140 mi) at its mouth. It forms part of the border between Argentina and Uruguay, with the major ports and capital cities of Buenos Aires (appearing as a grey area) and Montevideo on its western and northern shores, respectively. The coasts of the Río de la Plata are the most densely populated areas of Argentina and Uruguay.