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![Os rectory](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/kvh_236xxx.jpg?itok=hO_YXv5o)
![Hetlefloten i Os](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/723.jpg?itok=iwhgEn9w)
![From](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/190/nvh_312_vaksinen_ulven_150.jpg?itok=P4DdHVu-)
![Geologist William Helland-Hansen examining a quartz conglomerate in the Ulven Syncline on one of the hills by the north west end of Lake Ulvenvatnet.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/os_31.jpg?itok=kdZe21Du)
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.
![The monks leave their mark at Lysekloster](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/os_24.jpg?itok=Q5bQc7i9)
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.
![Den flate terrassen på moreneryggen på garden Tjedla viser kor høgt havet stod på slutten av den siste istida.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/304/skanevik_endret_til_rgb.jpg?itok=KfKszhQ9)
Skånevik- moraine
In Skånevik there are marks left from the ice edge that advanced during the thousand-year cold spell (Younger Dryas) that marked the end of the Ice Age roughly 11 500 years ago. The glacier first proceeded out into Åkra Fjordand and around Vannes and thereafter sent an arm in toward Skånevik. Here, the glacier lay down an end moraine up against the mountainside.
![Toward Støle and Sørheim, 1920.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/terassen.jpg?itok=1OuuZEj5)
The village of Etne
Much of the sand and gravel that the town of Etne is built on was laid down at the end of the Ice Age and is evidence of melting glaciers and roaring meltwater rivers. The uncompacted material in the big terraces leave their unmistakeable mark on the wide elongated valleys.
![Lyse Monastery, reconstruction](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/1/kvh-239_lysekloster.jpg?itok=bc_kHrFJ)
![Ferstad, Os](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/1/kvh_235-2-2.jpg?itok=C804au8t)
Ferstad
Ferstad is well worth a visit. The farm lies on a little hillock south of Lekven: a beautiful official residence from the 1700s.