Cape San Antonio, or in Spanish Cabo San Antonio, is a cape extending into the Atlantic Ocean on the eastern coast of Buenos Aires Province in eastern Argentina. It lies south of Samborombón Bay.Merriam-Webster's Geographical Dictionary, Third Edition, p. 1037.
This Cape is the southwest limit of the Río de la Plata
There are two notable lighthouses: San Antonio Lighthouse and Punta Médanos Lighthouse.
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References Merriam-Webster's Geographical Dictionary, Third Edition. Springfield, Massachusetts: Merriam-Webster, Incorporated, 1997.