|Location||Province of Varese, Lombardy|
|Surface area||4.85 km2 (1.87 sq mi)|
|Surface elevation||930 m (3,050 ft)|
Delio Lake is a lake in the Province of Varese, Lombardy, Italy. At an elevation of 930 m, its surface area is 4.85 km². It serves as the upper reservoir for the pumped-storage Roncovalgrande Hydroelectric Plant.
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