The history of Montepulciano Lake and of the whole Val di Chiana is marked by continuous reclamation attempts, which already began in the Etruscan period, when the Etruscans tried to avoid that the valleys turned into marshlands, helping the river Chiana (from "Clanis", probably an Etruscan term which is still today the Tuscan synonym for "marsh") to improve its drainage.
Further information (Italian text)