Treska is a 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...

 in the western part of the Republic of Macedonia

Republic of Macedonia

Macedonia , officially the Republic of Macedonia , is a country located in the central Balkan peninsula in Southeast Europe. It is one of the successor states of the former Yugoslavia, from which it declared independence in 1991...

, a right tributary to Vardar

Vardar

The Vardar or Axios is the longest and major river in the Republic of Macedonia and also a major river of Greece. It is long, and drains an area of around . The maximum depth of river is ....

. It is 132 km (82 mi) long, and its basin is 2350 km².

It rises in the Stogovo

Stogovo

Stogovo is a mountain in the western part of the Republic of Macedonia. It has impressive peaks: Golem Rid , Babin Srt , Kanesh and many more higher that 2000 meters above the sea level....

 mountain at an altitude of around 2000 meters, and flows eastwards through the valley of Kičevo

Kicevo

Kičevo is a city in the western part of the Republic of Macedonia, located in a valley in the south-eastern slopes of Mount Bistra, between the cities of Ohrid and Gostivar. The capital Skopje is 112 km away. The city of Kičevo is the seat of Kičevo Municipality.-Population:The municipality...

. At Makedonski Brod

Makedonski Brod

Makedonski Brod is a town in the central part of the country, on the south-eastern part of Suva Gora, western Karadžica and south-western Dautica mountains. The town is the seat of Makedonski Brod Municipality.-Geography:...

 it turns northwards, flows between the mountains of Suva Gora and Karadžica, finally flowing into the Vardar in the Skopje

Skopje

Skopje is the capital and largest city of the Republic of Macedonia with about a third of the total population. It is the country's political, cultural, economic, and academic centre...

 suburb Gjorče Petrov

Gjorce Petrov municipality

Gjorče Petrov is one of the ten municipalities that compose the city of Skopje, the capital of the Republic of Macedonia. It is named after the revolutionary Gjorče Petrov.-Geography:...

.

Two dams have been built on Treska:

• in 1937 the Matka dam and lake
  Matka Canyon
  Matka is a canyon located west of Skopje, Macedonia. Covering roughly 5,000 hectares, Matka is one of the most popular outdoor destinations in Macedonia and is home to several medieval monasteries.-Geology:...
  
   near Skopje
  Skopje
  Skopje is the capital and largest city of the Republic of Macedonia with about a third of the total population. It is the country's political, cultural, economic, and academic centre...
  
  
• in 2004 the Kozjak dam and lake
  Kozjak Hydro Power Plant
  Kozjak Hydro Power Plant is a large hydroelectric power plant on the river Treska which creates an artificial lake Kozjak, the largest in Republic of Macedonia...