Norderåa (or Nørderåa) is a small river in Elverum Municipality in Innlandet county, Norway. The river mouth lies a short distance to the southwest of the village of Heradsbygd. The main course has a length of and it is a tributary of the large river Glomma, falling into it from the west. The river likely got its name from the Norse god Njörðr.
See also List of rivers in Norway
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