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| Lake Idro Lago d'Idro | |
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  Lake Idro Lago d'Idro | |
| Location | Province of Brescia and Trentino, Northern Italy |
| Coordinates | 45°46′48″N10°30′36″E / 45.78000°N 10.51000°E |
| Primary inflows | Chiese, Caffaro, Re di Anfo |
| Primary outflows | Chiese |
| Catchment area | 617 km2 (238 sq mi) |
| Basin countries | Italy |
| Max. length | 11 km (6.8 mi) |
| Max. width | 1.9 km (1.2 mi) |
| Surface area | 11.4 km2 (4.4 sq mi) |
| Max. depth | 122 m (400 ft) |
| Water volume | 335 hm3 (272,000 acre⋅ft) |
| Shore length1 | 24 km (15 mi) |
| Surface elevation | 368 m (1,207 ft) |
| Settlements | Bondone, Idro, Anfo, Bagolino |
| 1 Shore length is not a well-defined measure. | |
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.
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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.
