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Arnatveit
On the farm of Arnatveit, high up on the slope above the highway, an old smokehouse remains standing in the courtyard of the main farm property, in the place of the old common courtyard. Today this farm lies at the outskirts of a large housing estate. Most of the farmland of the other farm properties has been sold to benefit the city’s need of sites for the new community of Arna.
Byparken
It isn't true that hungry students have hunted down basking ducks in the city park Byparken in their spring fervour, as rumours may have it. But, it is not unusual to see students throw themselves over the park's wild birds, and hold on to them tight. They ring the birds. Because of this, we know quite a lot about the birds in Byparken.
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.
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.
Sandviken
Close to the tunnel opening at Amalie Skrams vei in Ssandviken, there is a cultural monument of European dimensions; a rope making works that produced rope and fishing tackle for West and North Norway.
Sandviksfjellet
On Sandviksfjellet there are old boulders that have been made into mountains. The stones have been stretched out or squeezed together between huge slabs of rock, during slow, but powerfulprocesses of transport. This conglomerate shows, in quite a special way, the enormous powers that were active during the collision between Norway and Greenland over 400 million years ago.
Ulven
In the region of Ulven phyllite occurs with Hordaland's youngest fossils, and a beautiful quartz conglomerate. The phyllite and conglomerate got squeezed into the bottom of an ancient oceanic crust, made of gabbro and greenstone, in the heart of the Caledonide mountain chain.