Grosseto (grōs-sāˈtō) [key], city (1991 pop. 71,257), central Italy, capital of Grosseto prov., Tuscany region, on the Ombrone River near the Tyrrhenian Sea. Situated in the reclaimed Maremma area, it is an agricultural market. Nearby are the ruins of Russellae, an Etruscan town deserted in the 12th cent.
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