Sirdalsvatnet is a lake in the municipalities of Sirdal and Flekkefjord in Agder county, Norway.

The 18.8-square-kilometre (7.3 sq mi) lake is about 27 kilometres (17 mi) long running from the village of Tonstad in the north to the village of Sira in the south.

The lake is about 1 kilometre (0.62 mi) wide at its widest point.

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