Lago del Frassino, Lake and archaeological site in Peschiera del Garda, Italy.

Lago del Frassino is a small lake near Peschiera del Garda in the Veneto region, nestled among the moraine hills south of Lake Garda. It sits close to the point where the Mincio River begins, and its edges are lined with reeds, trees, and wetland areas.

Beneath the surface of the lake lie the remains of prehistoric pile dwellings, pointing to ancient communities that lived on the water here. These remains are part of a group of sites across the Alps recognized by UNESCO for their prehistoric value.

Between late September and April, thousands of diving ducks — mainly tufted ducks and common pochards — rest on the lake by day and fly to Lake Garda at night to feed on zebra mussels. The site is Italy's most important wintering ground for tufted ducks, hosting about a third of the national population. The shores are private property, and visits require authorisation from the Province of Verona's environmental wildlife office.

The lake lies between the hamlets of San Benedetto di Lugana and Broglie, in the countryside of Peschiera del Garda. The shores are private property: visits require authorisation from the Settore faunistico ambientale of the Province of Verona. Between late September and April thousands of diving ducks rest on the water by day.

The lake is one of the few places in Europe where the Lataste's frog still lives, a species that needs very clean and undisturbed water to survive. Its presence here is seen as a sign of how healthy the local ecosystem has remained over time.