The Orco is an Italian

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

 river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

. It originates in the glaciers of the Piedmont

Piedmont

Piedmont is one of the 20 regions of Italy. It has an area of 25,402 square kilometres and a population of about 4.4 million. The capital of Piedmont is Turin. The main local language is Piedmontese. Occitan is also spoken by a minority in the Occitan Valleys situated in the Provinces of...

ese slopes of Gran Paradiso

Gran Paradiso

The Gran Paradiso is a mountain group between the Aosta Valley and Piedmont regions of north-west Italy. The peak, the 7th highest mountain in the Graian Alps with an elevation of 4,061 m, is close to Mont Blanc on the nearby border with France. On the French side of the border, the park is...

, and after about 90 km (56 mi) reaches the Po River

Po River

The Po |Ligurian]]: Bodincus or Bodencus) is a river that flows either or – considering the length of the Maira, a right bank tributary – eastward across northern Italy, from a spring seeping from a stony hillside at Pian del Re, a flat place at the head of the Val Po under the northwest face...

 near Chivasso

Chivasso

Chivasso is a comune in the Province of Turin in the Italian region Piedmont, located about 20 km northeast of Turin. Chivasso has a population of about 25,000...

. Its drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 is home to the most important complex of hydropower

Hydroelectricity

Hydroelectricity is the term referring to electricity generated by hydropower; the production of electrical power through the use of the gravitational force of falling or flowing water. It is the most widely used form of renewable energy...

 in Piedmont, consisting of five dams: Agnel, Serrù, Ceresole, Piantonetto, Valsoera, and numerous turbines

Water turbine

A water turbine is a rotary engine that takes energy from moving water.Water turbines were developed in the 19th century and were widely used for industrial power prior to electrical grids. Now they are mostly used for electric power generation. They harness a clean and renewable energy...

.

The Orco is known also for its gold

Gold

Gold is a chemical element with the symbol Au and an atomic number of 79. Gold is a dense, soft, shiny, malleable and ductile metal. Pure gold has a bright yellow color and luster traditionally considered attractive, which it maintains without oxidizing in air or water. Chemically, gold is a...

-bearing sand, extracted already in antiquity. Even today there is a certain activity, on an amateur level, searching for grains of gold.