The Argentario and the Orbetello lagoon must be considered as a single ecosystem. The promontory is an ancient island, a relict of the so-called Tyrrhenis, a land in itself, now largely submerged, but of which the islands of the Tuscan archipelago were once also a part. Subsequently two strips of accumulated sand linked it to the terrafirma, delimiting the stretch of sea that became the coastal lagoon of Orbetello. These two land barriers known by the Tuscan term tomboli, that more correctly speaking means "dunes", are, respectively, the tombolo of Giannella to the north and the tombolo of Feniglia to the south.
The lagoon is linked to the sea by the channels of Nassa and of Ansedonia and, with the river Albegna, by the Canale Nuovo (new channel) of Fibbia (or delle Saline). The Argentario, culminating in Mount Telegrafo (635 m), is an irregular territory that rises steeply from the sea to the west, but slopes away more gently to the north. It is covered almost everywhere by Mediterranean scrub, particularly in the less accessible zones where the occasional rare specimen of the dwarf palm (chamaerops humilis) still survives. Produce of the land is chiefly olives, fruit trees and vines.
The latter make an excellent wine, Besides the Mediterranean scrub that consists, prevalently, of arbustus, lentisks, myrtle, heather, rosemary and other scented plants, the territory is further enriched by species of vegetation that elsewhere, due to man's improvidence, have become rare; vegetation typical of sandy coasts, swamps, and cliffs. One can find couch-grass, marram-grass, sea-holly, juniper, salicornia, marsh-reeds, and broom. There are also such trees as the holm-oak, the cork-oak and the maritime pine.
At Argentario, there is tourist accommodation available in hotels, farm holiday, farmhouse, residence self-catering accommodation, b&b, rooms for rent, holiday homes, camp sites and tourist villages.