There is no place in Hordaland where there are so many over-wintering song swans as in Tjeldstømarka. And there are few places in the county that have had this birdfowl as a guest for as long.
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.
The area around Lysekloster is one of the most popular places in Hordaland for picking mushrooms. The large variety of mushrooms probably stems from the varied, old, cultural landscape which has a lot of open grazing areas and several types of fir- and deciduous forests.
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.