Ytre Storevatnet is a lake in Bykle Municipality in Agder county, Norway. The lake makes up the northernmost part of the Svartevatnet reservoir that empties into the Sira River system. The lake is located just south of the lake Blåsjø and southwest of Botsvatn. The village of Bykle is about northeast of the lake.
See also List of lakes in Aust-Agder
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