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Yddal
Yddal is one of the biggest and finest pine forest areas in the county. The rich forest resources provided an important foundation for the settlement of Yddal. Up until about the 1950s, there were three farms here. Where the lumberjacks couldn't get to, the trees grew very big and can be over 300 years old.
Hopslia
Some of the giant trees in Hopslia north of Holme Fjord are as much as thirty metres high. Elm and ash are the most common, basswood somewhat rarer. Relatively soft bedrock, good growing conditions and enough light, help them to thrive just here.
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.
Rådalen
"...it would not be of any particular economical interest to support the planting of forest as the forest that can be cultivated will leave much to be desired in the way of growth potential." These words stem from the economist that at the end of the 1800s was sent to Stend to inspect the planned reforestation in person. The pioneer G.A.Wilson put the economist's words to shame. The spruce that was planted in Rådalen in the period 1867–1869 became a landmark. No other stand of forest in Scandinavia can boast more trees per unit area.
Rambjøra
In Sanddalen and Helldalsåsen the building of houses has increased dramatically. Where there eariery was grazing land, hundreds of families now live. Not far away, lies Rambjøra as an oasis in the built up area.