Lygna or Lyngdalselva is a river in Agder county, Norway. The river runs from the mountains in northern Hægebostad Municipality, through the Lyngdalen valley to Lyngdal Municipality to its mouth at Alleen, where it runs into Lyngdalsfjorden. Lygna has a discharge of , and a drainage basin covering . The river is called the Storåni north of the lake Lygne. The river passes the villages of Tingvatn, Snartemo, and Kvås as well as the town of Lyngdal.
See also List of rivers in Norway
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