Oglio

Oglio
The river between Soncino and Orzinuovi
Course of the river Oglio
Native nameÒi / Ùi (Lombard)
Location
countryItaly
regionLombardy
provincesBrescia, Bergamo, Cremona, Mantua
Physical characteristics
SourceValle delle Messi, as Frigidolfo branch
 • locationnear Punta Valmalza, Sobretta-Gavia Group, Ortler Alps, Lombardy
 • coordinates46°20′31.5″N 10°27′03.5″E / 46.342083°N 10.450972°E / 46.342083; 10.450972
 • elevation3,035 m (9,957 ft)
2nd sourceLake Ercavallo, Valle di Viso, as Arcanello branch
 • locationat the slopes of Cima di Caione, Ortler Alps, Lombardy
 • coordinates46°20′21.1″N 10°31′35.5″E / 46.339194°N 10.526528°E / 46.339194; 10.526528
 • elevation2,621 m (8,599 ft)
3rd sourceLake Pisgana, as Narcanello branch
 • locationNarcanello Valley, near Vedretta di Pisgana, Presena glacier, Adamello-Presanella Alps, Lombardy
 • coordinates46°12′22″N 10°31′49″E / 46.20611°N 10.53028°E / 46.20611; 10.53028
 • elevation2,500 m (8,200 ft)
4th sourceOgliolo branch
 • locationCorteno Valley, on the provincial border between Corteno Golgi, province of Brescia and Aprica, province of Sondrio, Lombardy, near Zappello dell'Asino
 • coordinates46°08′52″N 10°09′54.2″E / 46.14778°N 10.165056°E / 46.14778; 10.165056
 • elevation1,172 m (3,845 ft)
Source confluenceconfluence of Frigidolfo and Narcanello branches
 • locationPonte di Legno, province of Brescia, Lombardy
 • coordinates46°15′32.7″N 10°30′28.7″E / 46.259083°N 10.507972°E / 46.259083; 10.507972
 • elevation1,253 m (4,111 ft)
MouthPo
 • location
at the municipal border between Marcaria and Viadana, province of Mantua, Lombardy
 • coordinates
45°02′40″N 10°39′37″E / 45.04444°N 10.66028°E / 45.04444; 10.66028
Length280 km (170 mi)
Basin size6,649 km2 (2,567 sq mi)
Discharge 
 • average137 m3/s (4,800 cu ft/s)
Basin features
ProgressionPoAdriatic Sea
View of the confluence of the Frigidolfo branch (left) and the Narcanello branch (right), Ponte di Legno
River Oglio at Berzo Demo, Val Camonica

The Oglio (Italian: [ˈɔʎʎo]; Latin: Ollius or Olius; Lombard: Òi, Cremonese: Ùi) is a left-side tributary of the river Po in Lombardy, Italy. It is 280 kilometres (170 mi) long. In the hierarchy of the Po's tributaries, with its 280 kilometres (170 mi) of length, it occupies the 2nd place per length (after the river Adda), while it is the 4th per basin surface (after Tanaro, Adda and Ticino), and the 3rd per average discharge at the mouth (after Ticino and Adda).