Herefossfjorden is a 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 Birkenes
Birkenes is a municipality in Aust-Agder county, Norway. It is located in the traditional district of Sørlandet. The village of Birkeland is the administrative center and about half of the municipality's residents live there...

 in Aust-Agder
is a county in Norway, bordering Telemark, Rogaland, and Vest-Agder. In 2002, there were 102,945 inhabitants, which is 2.2% of the total population in Norway. Its area is . The administrative center of the county is in Arendal....

 county, 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...

. It is part of the Tovdalselva
Tovdalselva or Topdalselva is long and is one of the longest rivers in Southern Norway. The river flows from the northeast to the southwest and reaches the sea at the Topdalsfjorden between Hamresanden and Kjevik...

 river. The Gauslåfjorden and Uldalsåna
Uldalsåna is a lake in the municipalities of Birkenes and Froland in Aust-Agder county, Norway. It is part of the Tovdalselva river drainage basin. On the southeastern end of the lake, there is a hydroelectric dam which releases water into the waterfall, Hanefoss, on its way down to the...

 lakes flow into Herefossfjorden near the village of Herefoss
Herefoss is a village and former municipality in Aust-Agder county, Norway. It is located in the present-day municipality of Birkenes in the Sørlandet region....

. The Uldalsåna lake is held back by a 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...

 and the Gauslåfjorden flows over a waterfall
A waterfall is a place where flowing water rapidly drops in elevation as it flows over a steep region or a cliff.-Formation:Waterfalls are commonly formed when a river is young. At these times the channel is often narrow and deep. When the river courses over resistant bedrock, erosion happens...

into the Herefossfjorden.
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