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Course of the river Oglio
Country Italy
Physical characteristics
Main source Corno dei Tre Signori, Prealpi Orobiche, Lombardy
about 2,600 m (8,500 ft)
River mouth Po, near Torredoglio, province of Mantua
Length 280 km (170 mi)
  • Average rate:
    130 m3/s (4,600 cu ft/s)
Basin features
Basin size 6,649 km2 (2,567 sq mi)

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