|Primary inflows||Rettåna and
|Surface area||3.00 km2 (1.16 sq mi)|
|Shore length1||34.34 km (21.34 mi)|
|Surface elevation||149 m (489 ft)|
1 Shore length is not a well-defined measure.
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 Herefossfjorden near the village of Herefoss.
See also 
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