[2] The Province of Grosseto completely occupies the southern end of Tuscany, and with a territorial area of 4,504 square kilometres (1,739 sq mi), it is the most extensive in the region and one of the least dense in population in Italy.

The Arcipelago Toscano National Park spans both the provinces of Grosseto and Livorno, and includes the seven main islands of the Tuscan Archipelago: Elba, Isola del Giglio, Capraia, Montecristo, Pianosa, Giannutri, Gorgona, and some of the minor islands and rock outcrops.

[4] The highest point in the park is Mount Capanne, at 1,019 metres (3,343 ft) in elevation, on the island of Elba.

[6] The principal rivers are the Ombrone,[7] Fiora, Albegna, Pecora, Bruna, Merse, Lente [it], Farma and Chiarone.

The coastline between the Gulf of Follonica and the mouth of the Chiarone is dominated by blue waters and pine forests, and is home to resorts such as Marina di Grosseto, Principina a Mare, Castiglione della Pescaia, Punta Ala, Puntone di Scarlino and Talamone.