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Valldalen
Valldalen or Valdalen, the name that the locals used in past times, had been a permanent settlement for a long time, and later the biggest mountain-farm valley in western Norway. Since that time there have been many changes: Most of the fields are no longer in use. Bjørkeskogen, a birch forest that had grown in the valley for thousands of years, took more and more over. And in the valley bottom, the Valldals dam now keeps the artificially large Valldalsvatnet Lake in place.
Lysekloster- The monks and nature
Lysekloster was the largest agricultural property in the country when it was phased out during the Reformation in 1537. In its prime this cloister encompassed two-thirds of all the farms in Os. The monks introduced and cultivated new plant species and it was probably they who stocked the waters with fish not indigenous to the area. This legacy from the Middle Ages has left a lasting mark.