Like the promontory of Piombino and other minor headlands, Argentario was originally an island, which over the centuries became connected to the nearby mainland, primarily because of the Feniglia Tombolo (action of marine currents ) and then also due to the Giannella Tombolo (run-off from the nearby Albegna river)

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Once joined to the mainland by two strips of sand, the inside of the cape has become Orbetello lagoon, whose origin is contemporary to the processes that led to the transformation from island to the Argentario promontory.

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The territory of the promontory is hilly and in some areas is completely inaccessible, softened only by man who created the terraces where Ansonica Argentario and olive trees are grown.

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Two towns are located on the promontory: Porto Santo Stefano (northwest), where the City hall of Monte Argentario is, the more ancient Porto Ercole (south-east), and the famous Cala Galera. A constant wind makes this area famous for sailboat races that take place all year round between Giglio, Giannutri and Elba islands.
In Porto Ercole you’ll find a beautiful 27-hole golf course with a modern club house.