Uldalsåna

Uldalsåna
Hanefoss reservoir
Uldalsåna Location of the lake Show map of Aust-Agder Uldalsåna Location of the lake Show map of Norway
Location	Birkenes and Froland, Aust-Agder
Coordinates	58°32′38″N 08°18′15″E / 58.54389°N 8.30417°E / 58.54389; 8.30417Coordinates: 58°32′38″N 08°18′15″E / 58.54389°N 8.30417°E / 58.54389; 8.30417
Primary inflows	Rettåna and Skjeggedalsåna
Primary outflows	Herefossfjorden
Basin countries	Norway
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)
References	NVE
1 Shore length is not a well-defined measure.

Uldalsåna is a lake on the border of 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 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.