Lake Idro (Italian: Lago d'Idro, also Eridio from Latin: Eridius lacus, Lombard: Lac d'Ider, German: Idrosee) is an Italian prealpine lake of glacial origin situated largely within the Province of Brescia (Lombardy) and in part in Trentino.

At 368 m above sea level it is the highest of the Lombard prealpine lakes. The lake is fed principally by the waters of the river Chiese; that river is also its only emissary. It has a surface area of 11.4 km2 and a maximum depth of 122 m.

The lake is surrounded by wooded mountains. The shoreline of some 24 km is shared across four communes: Idro (the frazioni Crone and Lemprato), from which the lake takes its name, Anfo, Bagolino (fraz. Ponte Caffaro) and Bondone (fraz. Baitoni).

Lake Idro currently has become a site of conflict between environmental, agricultural and electricity industry interests.

The name derives from a legendary monster (Idra) who supposedly lived there.

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See also

  • (in Italian)