Nelaug is a lake in Agder county, Norway. It is located in both Froland Municipality and Åmli Municipality. The lake is formed by a dam which regulates a hydroelectric power plant on the Nidelva river. The village of Nelaug is located near the dam in Froland Municipality. The lake is located about south of the village of Åmli, about southeast of the village of Dølemo, and about north of Blakstad.
Name The Old Norse form of the name must have been Niðlaug. The first element is Nið is the old name of the river Nidelva. The word is identical to the Old Norse word which means "new moon" or "waning moon". The last element is which means "bath" or "hot spring".
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See also List of lakes in Aust-Agder
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