The Maremma is a vast territory and the borders are difficult to define overlooking the Tyrrhenian Sea. Conventionally, the Maremma is divided into three areas: The Maremma, Maremma or proper, is the central part of the province of Grosseto, along the coast between the Gulf of Follonica and the Chiarone mouth of the river that flows into the sea south of the Argentario peninsula and includes even the lower valley Ombrone. Generally, the name is locally extended to hilly areas inland, not geographically annoverabili in Maremma, such as metalliferous hills of Grosseto, the hills of Albegna and Fiora and the Area del Tufo, up to finish in front of the large area the heights of Mount Amiata. Among the main town Grosseto, Follonica, Castiglione della Pescaia, Porto Santo Stefano and Orbetello, as well as Massa Marittima has the old town area of ​​the metalliferous hills but a good part of the municipality geographically included in the Maremma. Historically called Maremma Senese, because the domain of the Republic of Siena, has assumed its present name following the establishment in the Lorraine period of the compartment of Grosseto derived from the province of Siena below. The Maremma is divided from north to south into four parts. The plain of the river Pecora, around the Gulf of Follonica, including much of the municipal area of ​​Follonica, the flat area of ​​the towns of Massa Marittima and Gavorrano and the coastal strip of the municipality of Scarlino, limited to the south by the headland Punta Ala. The plain of the river Ombrone, which occupies the municipalities of Castiglione della Pescaia and Grosseto, the southern part of the municipalities of Gavorrano and Roccastrada and the coastal stretch, plain and foothills of the town of Magliano in Toscana. It stretches between the promontory of Punta Ala and Uccellina Mountains. The plain of the river Albegna, which includes the municipalities of Orbetello and the flat area of ​​the towns of Manciano and Magliano in Toscana. It stretches from the Uccellina Mountains and the promontory of Ansedonia and includes the promontory of Argentario and the Orbetello lagoon. The plain of the river Fiora, between the municipality of Capalbio and Lazio. It extends beyond the promontory of Ansedonia and no interruption with the Lazio region; It includes Lake Burano. The Maremma Pisana or Maremma Livornese, also called Alta Maremma or Northern Maremma, covers most of the province of Livorno and foothill areas of the province of Pisa, extending in the north along the coast and the hinterland between Rosignano maritime and Piombino, including the foothills hills of the Val di Cecina and Val di Cornia and the north-western side of the Metalliferous Hills. Among the main towns of the area include Rosignano Maritime, Cecina Riparbella, Montescudaio, Guardistallo, Casale Marittimo, Bibbona, Bolgheri, Castagneto Carducci, Campiglia Marittima, Suvereto, San Vincenzo, Populonia and Piombino. The whole territory, historically called Maremma Pisana, because ancient rule of the Republic of Pisa, with the passing of years has been broken down into two entities, which coincide with the administrative boundaries created in 1925 of its provinces, although geographically uniform. However it is considered correct from the point of view of both the historical and geographical calling indiscriminately throughout the northern Maremma, the territories now in the province of Pisa than those in the province of Livorno, with the name of Maremma Pisana [3], the name under which these territories have been known for centuries. the Lazio region, the southern part, extends in the western part of the province of Viterbo and the north-western province of Rome (Lazio), along the coast of Lazio and the immediate hinterland of plain and foothills Tuscia, between the mouth of the river Chiarone and Cape Linaro, the promontory that forms the western addition of the Tolfa mountains that divide dall'Agro Romano. Among the main towns of the area stand out Vulci, Montalto di Castro, Canino, Cellere, Ischia Di Castro, Tarquinia, Tuscania.