San Matías Gulf

Argentina / Chubut / Puerto Madryn /
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The San Matías Gulf is an inlet of the Atlantic Ocean off the coast of Patagonia, Argentina. It is bordered by the Río Negro Province to the north and west, and the Valdes Peninsula of the Chubut Province to the south. It is "one of the largest gulfs in the Patagonia region".[1]

The gulf was the subject of scientific investigation for its unusually large sand waves and their movement.
Wikipedia article: http://en.wikipedia.org/wiki/San_Matías_Gulf
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Coordinates:   41°29'50"S   64°27'44"W