Uldalsåna is a lake in Agder county, Norway. The lake lies on the border of Birkenes Municipality and Froland Municipality. 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.
See also List of lakes in Aust-Agder List of lakes in Norway
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