Aursunden is a lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in the municipality of Røros

Røros

is a town and municipality in Sør-Trøndelag county, Norway. It is part of the Gauldalen region. The administrative centre of the municipality is the town of Røros. Other villages include Brekken, Glåmos, Feragen, Galåa, and Hitterdalen....

 in Sør-Trøndelag

Sør-Trøndelag

- References :...

 county, Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. The village of Brekken

Brekken

Brekken is a village and former municipality in Sør-Trøndelag county, Norway. It was located in the northeastern part of the present-day municipality of Røros...

 lies along the eastern shore and Glåmos

Glåmos

Glåmos is a village and former municipality in Sør-Trøndelag county, Norway. It was located in the northwestern part of the present-day municipality of Røros. The village of Glåmos is located along the river Glåma, just west of the lake Aursund and about north of the town of Røros...

 lies along the western shore.

There are several inflows to the 46 square kilometres (17.8 sq mi) lake including the lakes Rien, Riasten

Riasten

Riasten is a lake in the municipality of Holtålen in Sør-Trøndelag county, Norway. The lake lies near the border with Tydal and Røros, about east of Ålen/Renbygda....

, and Bolagen

Bolagen

Bolagen is a lake in the municipality of Røros in Sør-Trøndelag county, Norway. The lake is located about southeast of the village of Brekken and about west of the border with Sweden. The large lake Aursunden lies about to the west of Bolagen....

. The outflow is regulated by a hydropower

Hydropower

Hydropower, hydraulic power, hydrokinetic power or water power is power that is derived from the force or energy of falling water, which may be harnessed for useful purposes. Since ancient times, hydropower has been used for irrigation and the operation of various mechanical devices, such as...

 dam

Dam

A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are...

 which water passes through into the river Glomma

Glomma

The Glomma or Glåma is the longest and largest river in Norway. The long river has a drainage basin that covers a full 13% of Norway's area, all in the southern part of Norway.-Geography:...

.

Aursunden is often cited as the source of Glomma

Glomma

The Glomma or Glåma is the longest and largest river in Norway. The long river has a drainage basin that covers a full 13% of Norway's area, all in the southern part of Norway.-Geography:...

 river, the longest and largest river in Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. The actual headwaters are near Aursunden near the start of the Glommadal

Glommadal

Glommadal is a valley in Norway formed by the river Glomma . Glåmdalen is also a newer designation for the traditional district around the river Glomma, especially Odalen, Solør and in a wider sense the name is used also by Østerdalen.-Geography:From Lake Aursund in the north on south to Elverum,...

valley. The locals claim that the headwater of the Glomma river is Mustjønna, a tiny lake about 30 kilometres (18.6 mi) north of Aursunden.