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Just south of Fällfors you will find the Västerbotten Grand Canyon: Marranäsvältan. An underground brook formed the steep sandy riverbanks. The canyon is 160 metres long with an average depth of 30 metres. The sand downs give way all the time - in some places erosion steeps, over 50 metres high, have appeared. The name Marranäs, which is really the neck of land on the northern side of the river, probably derives from the fact that horses (mares) used to graze here. Guided tours Guidade turer i Fällfors