Fyresvatn

Fyresvatn, or Fyresvatnet, is the fifth-deepest lake in Norway with a depth of .
It is located in Fyresdal municipality, part of Vestfold og Telemark county.
Fyresvatn belongs to the Arendal watershed, and discharges via the Fyreselv river into the Nidelva river, which flows into the Skagerrak at Arendal in the county of Aust-Agder.