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Course of the river Oglio
Physical characteristics
 - locationCorno dei Tre Signori, Prealpi Orobiche, Lombardy
 - elevationabout 2,600 m (8,500 ft)
 - location
Po, near Torredoglio, province of Mantua
Length280 km (170 mi)
Basin size6,649 km2 (2,567 sq mi)
 - average130 m3/s (4,600 cu ft/s)

The Oglio (Italian: [ˈɔʎʎo]; Latin Ollius, or Olius; Lombard Òi) is a left-side tributary of the Po River in Lombardy, Italy. It is 280 kilometres (170 mi) long.


The Oglio is formed from the confluence of two mountain streams, the Narcanello from the Presena Glacier, in the Adamello group and the Frigidolfo, originating from Lake Ercavallo, in the Corno dei Tre Signori, part of the Stelvio National Park. The streams merge near Pezzo di Ponte di Legno.

It flows in a southwest direction, through Valcamonica and enters into the Lake Iseo at Costa Volpino. It leaves Lake Iseo at Sarnico and, after traveling a zone of moraine deposits, it joins the Po river at Torredoglio, not far from Cesole and Scorzarolo, in the province of Mantua. Its drainage basin, which corresponds to the region of Valle Camonica, covers 6,649 square kilometres (2,567 sq mi). It is part of the larger Po-Adige basin.

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Coordinates: 45°02′40″N 10°39′37″E / 45.04444°N 10.66028°E / 45.04444; 10.66028