Østerdalen

Østerdalen or Østerdal is a valley and traditional district in the eastern part of Norway, consisting of the municipalities Rendalen, Alvdal, Folldal, Tynset, Tolga and Os in the north, Elverum, Stor-Elvdal, Engerdal,Trysil and Åmot in the south.

The upper river valleys of Norwegian rivers have distinctive names which are vestiges of earlier cultural distinctions such as building styles, traditional clothing or bunad and domestic crafts. The upper valley of the Glomma is the Østerdal (literally Eastern Valley, the -en ending in Norwegian corresponds to the definite article the in English).

Østerdalene (Norwegian plural form) is the collection of valleys in the region, including the Trysil valley, Engerdal, Rendal and Glomdal.