|Location||Birkenes and Froland, Agder|
|Primary inflows||Rettåna and|
|Max. length||4 kilometres (2.5 mi)|
|Max. width||750 metres (2,460 ft)|
|Surface area||3 km2 (1.2 sq mi)|
|Shore length1||34.34 kilometres (21.34 mi)|
|Surface elevation||149 metres (489 ft)|
|1 Shore length is not a well-defined measure.|
Uldalsåna is a lake on the border of the municipalities of Birkenes and Froland in 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 lake Herefossfjorden near the village of Herefoss. The lake is fed by the rivers Rettåna and Skjeggedalsåna. The lake Nystølfjorden flows into the river Skjeggedalsåna.
Froland is a municipality in Agder county, Norway. It is part of the traditional region of Sørlandet. The administrative center is the village of Blakstad, which along with Osedalen form the main population center of the municipality. Other villages in Froland include Bøylefoss, Bøylestad, Froland, Frolands verk, Heldalsmo, Hinnebu, Hynnekleiv, Jomås, Lauvrak, Libru, Løvjomås, Mjåvatn, Mjølhus, Mykland, and Risdal.
Birkenes is a municipality in Agder county, Norway. It is located in the traditional district of Sørlandet. The administrative centre of the municipality is the village of Birkeland, where about half the municipal population lives. Other villages in Birkenes include Ås, Engesland, Flakk, Håbbesland, Herefoss, Mollestad, Oggevatn, Rugsland, Senumstad, Søre Herefoss, Svaland, Tveide, and Væting.
Øyarvatnet or Øyarvatn is a lake in Norway. It sits on the border between the municipalities of Valle and Sirdal in Agder county, about 30 kilometres (19 mi) northeast of the village of Lunde, Sirdal and about 32 kilometres (20 mi) west of Austad in Bygland. The lake is part of the Kvina river system. It is located just to the south of the lake Rosskreppfjorden, which flows into it. The dam at the south end of the 8.05-square-kilometre (3.11 sq mi) lake keeps it at an elevation of 837 metres (2,746 ft).
Vatndalsvatnet or Vatnedalsvatnet is a lake in the municipality of Bykle in Agder county, Norway. The 14.42-square-kilometre (5.57 sq mi) lake lies about 3 kilometres (1.9 mi) west of the village of Berdalen and the river Otra. The nearby lakes Ormsavatnet and Store Urevatn flow into the lake through dams and canals. The lake Vatndalsvatnet also has a dam on it and the water flows out of the lake from the dam into the Otra river. The lake is located in the central part of Bykle, about halfway between the villages of Hovden and Bykle. The mountains Snjoheinuten and Kvervetjønnuten both lie on the south side of the lake.
Longerakvatnet or Longeraksvatnet is a lake in the municipality of Bygland in Agder county, Norway. It has a small dam on the southwest side to regulate the water level for hydro-electric power generation at a plant located down the hill. The lake discharges into the Longeraksåni river which flows into the Byglandsfjorden near the village of Longerak. The 3.4-square-kilometre (1.3 sq mi) lake is located about 6 kilometres (3.7 mi) southeast of the village of Lauvdal and about 10 kilometres (6.2 mi) northeast of the village of Byglandsfjord.
Nasvatn is a lake in the municipality of Åmli in Agder county, Norway. It is located about 3.5 kilometres (2.2 mi) north of the village of Hillestad in the mountains above the Tovdal river valley. The lake has a small dam on the southwestern end, and the water leaving the lake goes down a large waterfall and eventually drains in the river Tovdalselva.
Nystølfjorden is a lake on the border of the municipalities of Birkenes and Froland in Agder county, Norway. It is part of the Tovdalselva river drainage basin. It flows into the Vågsdalsfjorden and eventually the Uldalsåna before emptying into the Herefossfjorden.
Kvifjorden is a lake in Norway that straddles the borders of the municipalities of Bygland, Sirdal and Kvinesdal Agder county. The lake was created when a dam was built along the Kvina river.
Hartevatnet or Hartevatn is a lake in the municipality of Bykle in Agder county, Norway. It is located along the river Otra, on the south side of the village of Hovden. The lake is a good fishing spot and it contains lots of brown trout. The Norwegian National Road 9 runs along the eastern shore of the lake. The lake Skyvatn lies about 6 kilometres (3.7 mi) to the northwest and the lake Holmavatnet lies about 13 kilometres (8.1 mi) to the northwest.
Herefossfjorden is a lake in the municipality of Birkenes in Agder county, Norway. The 3.7-square-kilometre (1.4 sq mi) lake is about 9 kilometres (5.6 mi) long and it is part of the Tovdalselva river. The Gauslåfjorden and Uldalsåna lakes flow into Herefossfjorden near the village of Herefoss at the northern end of the lake. The Uldalsåna lake is held back by a dam and the Gauslåfjorden flows over a waterfall into the Herefossfjorden. The Norwegian National Road 41 runs along the eastern shore. The village of Herefoss lies on the northern edge of the lake and the village of Søre Herefoss lies at the southern end of the fjord. The old municipality of Herefoss existed from 1838 until 1967 and it included all the land surrounding the lake.
Hovatn or Hovatnet is a lake in the municipality of Bygland in Agder county, Norway. It is part of the Otra river drainage basin. The 6.85-square-kilometre (2.64 sq mi) lake is regulated and is used by the nearby Hovatn hydroelectric power plant. The dam has an outlet into the Hovassåni river which empties into the Åraksfjorden near Åraksbø.
Botsvatn or Bossvatn is a lake in the municipality of Bykle in Agder county, Norway. The 14.6-kilometre (9.1 mi) long, narrow reservoir is located just to the southeast of the large lake Blåsjø and northeast of the lake Ytre Storevatnet. The lake holds water for the Brokke Hydroelectric Power Station, located in nearby Valle municipality. The water from the lake can flow out into the nearby river Otra, but only when water is released from the dam.
Byglandsfjorden is a lake in Agder county, Norway. The 32.79-square-kilometre (12.66 sq mi) lake lies on the river Otra, primarily in the municipality of Bygland, but the far southern tip of the lake extends into the neighboring municipality of Evje og Hornnes. The river flows out of the lake Åraksfjorden to the north and into the Byglandsfjorden through a narrow channel, and the southern end of the Byglandsfjorden is marked by a dam along the river. The villages of Byglandsfjord, Grendi, Longerak, Lauvdal, and Bygland are all located on the eastern shore of the lake along the Norwegian National Road 9. The western shore of the lake is much more sparsely populated, with County Road 304 following that shoreline.
Straumsfjorden or Straumfjorden is a lake that is located along the border of the municipalities of Bygland and Valle in Agder county, Norway. The lake has a dam on the south end which discharges into the Hjellevatn lake and eventually travels to the lake Topsæ and the Tovdalselva river drainage basin. The lake sits in the southeastern part of the municipality, about 11 kilometres (6.8 mi) southeast of the village of Rysstad and about 10 kilometres (6.2 mi) northeast of Besteland.
Syndle is a lake in the municipality of Grimstad in Agder county, Norway. It is located in the Landvik area, about 5 kilometres (3.1 mi) northwest of the center of the town of Grimstad. The 6-square-kilometre (2.3 sq mi) lake Syndle flows into a small river on the northeast part of the lake which connects it to the neighboring lake Rore which eventually flows into the river Nidelva.
Gravatnet is a lake in the municipality of Sirdal in Agder county, Norway. The 5.33-square-kilometre (2.06 sq mi) lake is located about 9 kilometres (5.6 mi) north of the small village of Lunde. The lake lies immediately south of the lake Valevatn, which flows out into Gravatnet. The water in Gravatnet is stopped by a dam on the south side. The water is regulated at an elevation of 660 metres (2,170 ft) and it flows out through the small river Gravassåni which is a tributary of the big river Sira.
Lygne is a lake in the municipality of Hægebostad in Agder county, Norway. The 7.56-square-kilometre (2.92 sq mi) lake is part of the river Lygna. The lake begins near the village of Eiken in the north and stretches about 10.4 kilometres (6.5 mi) to the south to the village of Tingvatn. Part of the western shore has fairly steep cliffs overlooking the lake, but the rest of the shoreline is relatively flat with houses and roads.
Valevatn is a lake in the municipality of Sirdal in Agder county, Norway. The 6.97-square-kilometre (2.69 sq mi) lake lies just north of the lake Gravatnet and a short distance west of the village of Kvæven. There are two dams on the east side of the L-shaped lake. The lake drains into the lake Gravatnet and the river Sira which runs just east of the lake.
Øre or Ørevatn is a lake in the municipality of Åseral in Agder county, Norway. The 3.82-square-kilometre (1.47 sq mi) lake is located at the confluence of the rivers Logna and Monn at the village of Kyrkjebygda. Near the southern end of the lake, the river Mandalselva flows southwards. The village of Eikerapen lies along the southwestern shore of the lake.
Ytre Storevatnet is a lake in the municipality of Bykle in Agder county, Norway. The 2.8-square-kilometre (1.1 sq mi) lake makes up the northernmost part of the Svartevatnet reservoir that empties into the Sira River system. The lake is located just south of the lake Blåsjø and southwest of Botsvatn. The village of Bykle is about 25 kilometres (16 mi) northeast of the lake.