|Primary inflows||Ormsavatnet and
|Primary outflows||Otra river|
|Surface area||14.42 km2 (5.57 sq mi)|
|Shore length1||29.76 km (18.49 mi)|
|Surface elevation||840 m (2,760 ft)|
|1 Shore length is not a well-defined measure.|
Vatndalsvatnet or Vatnedalsvatnet is a lake in the municipality of Bykle in Aust-Agder county, Norway. The nearby lakes Ormsavatnet and Store Urevatn flow into the lake through dams and canals. 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.
- "Vatndalsvatnet" (in Norwegian). yr.no. Retrieved 2010-05-16.
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