Oglio

Oglio
The river between Soncino and Orzinuovi
Course of the river Oglio
Native name	Òi / Ùi (Lombard)
Location
country	Italy
region	Lombardy
provinces	Brescia, Bergamo, Cremona, Mantua
Physical characteristics
Source	Valle delle Messi, as Frigidolfo branch
• location	near Punta Valmalza, Sobretta-Gavia Group, Ortler Alps, Lombardy
• coordinates	46°20′31.5″N 10°27′03.5″E / 46.342083°N 10.450972°E / 46.342083; 10.450972
• elevation	3,035 m (9,957 ft)
2nd source	Lake Ercavallo, Valle di Viso, as Arcanello branch
• location	at the slopes of Cima di Caione, Ortler Alps, Lombardy
• coordinates	46°20′21.1″N 10°31′35.5″E / 46.339194°N 10.526528°E / 46.339194; 10.526528
• elevation	2,621 m (8,599 ft)
3rd source	Lake Pisgana, as Narcanello branch
• location	Narcanello Valley, near Vedretta di Pisgana, Presena glacier, Adamello-Presanella Alps, Lombardy
• coordinates	46°12′22″N 10°31′49″E / 46.20611°N 10.53028°E / 46.20611; 10.53028
• elevation	2,500 m (8,200 ft)
4th source	Ogliolo branch
• location	Corteno Valley, on the provincial border between Corteno Golgi, province of Brescia and Aprica, province of Sondrio, Lombardy, near Zappello dell'Asino
• coordinates	46°08′52″N 10°09′54.2″E / 46.14778°N 10.165056°E / 46.14778; 10.165056
• elevation	1,172 m (3,845 ft)
Source confluence	confluence of Frigidolfo and Narcanello branches
• location	Ponte di Legno, province of Brescia, Lombardy
• coordinates	46°15′32.7″N 10°30′28.7″E / 46.259083°N 10.507972°E / 46.259083; 10.507972
• elevation	1,253 m (4,111 ft)
Mouth	Po
• 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
Length	280 km (170 mi)
Basin size	6,649 km2 (2,567 sq mi)
Discharge
• average	137 m3/s (4,800 cu ft/s)
Basin features
Progression	Po→ Adriatic Sea

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).