The Lake Accesa (ant.te Lacchise Lacus) is in the degradation of the Metalliferous Hills towards Grosseto Maremma, at the southern end of the municipality of Massa Marittima. The lake, karst, gives life to the river Bruna, and is characterized by an average depths ranging between 20 and 40 meters, has the typical lake flora, with shrubs and reeds that grow near the shore.

The lake was already known in ancient times.

Insediaronono the Etruscans as early as the sixth century BC Accesa in the Lake, thanks to the presence of nearby mineral deposits of silver, lead, iron ore and gold, although the latter is rather poor in quantity. The Etruscans developed industrial district on the nearby hill area: many traces still remain in the park, where you can see also some tombs and ruins of apartment buildings.

Industrial activity continued in the following centuries, both during the Roman era as well, ending its cycle ultrabimillenario during the eighteenth century. In the village of Forni and The Accesa Pesta, located within the park [1], are the remains of blast furnaces in steel industry witnessing the past, linked to the mining industry.

The interruption of industrial activities coincided with the beginning of the reclamation works undertaken by the eighteenth-century Lorraine, which led, among other things, a significant reduction of the lake surface, obtained in favor of new land for agricultural activities, mainly related to the cultivation tobacco.