The Tombolo della Giannella is a strip of land about 6 km long and about an average width of just over 300 meters, which goes from Monte Argentario to the mouth of the Albegna river. It is located for all its extension in the municipality of Orbetello and is wetted to the northwest by the Tyrrhenian Sea and to the south east by the Orbetello di Ponente lagoon.
Its formation is due to the detrital contributions of the Albegna river, tributary of the Tyrrhenian Sea. The sandy beach, which extends along the entire length of the tombolo and is sheltered from the sirocco winds, is a destination for summer seaside tourism. The waters are shallow.
The tombolo is crossed longitudinally from the provincial road 36 which can be accessed from Via Aurelia near Albinia.
It is conventionally divided into the areas of Santa Liberata, near Monte Argentario and where is located the village of Giannella, Lido di Giannella, in the central part and Saline, near the river Albegna.
In Saline there is one of the Spanish fortifications of the ancient State of the Presidios, the Forte delle Saline and another building of the same period, known as Casale Spagnolo. In the same area once were the ancient salt pans, which gave the name to the neighboring center of Albinia (from the Latin albis = white).
It is cut by two artificial channels (Fibbia canal and Nassa canal) built to ensure the supply of sea water to the Orbetello Lagoon.