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The Uruguayan seashore is characterized by sandy beaches and coastal dunes which subtend between stony headlands, as Solanas cliffs. On Sierra Ballena, where orographic elements advance like a whale into the River Plate estuary, the waves have created caves, quite significant in size, called grottoes. Most of them are made up of quartzite, a sandstone which has been converted into a solid quartz rock.
La costa uruguaya está caracterizada por playas arenosas y dunas costeras que se extienden entre promontorios rocosos como los acantilados de Solanas. En la Sierra Ballena, donde los elementos orográficos avanzan como un cetáceo en las aguas salobres del Río de la Plata, las olas han socabado hendiduras y cavernas entre las rocas denominadas grottos. La mayorías de estas están compuestas por cuarzita, una piedra arenisca que se ha transformado en cuarzo sólido.

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