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![Spring in the black alder forest of Hystadsmarkjo.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/stord_8.jpg?itok=uKjQ61DI)
Hystad- the black alder forest
One of the biggest black alder forests in the country is in Hystadmarkjo. Along the well prepared trail through the forest you can experience an exceptional nature with an unusual abundance of exuberant plant species. But what has laid the foundation for this richness?
![Stordfjella mountain towards the south.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/stord_38.jpg?itok=IY1GTmKU)
Kattnakken–Stovegolvet
The highest mountainous area on Stord, including Kattnakken, Midtfjellet and Stovegolvet, has more in common with the mountainous terrain on the mainland than in the low coastal landscape of Sunnhordland. The volcanic bedrock together with the erosive powers of nature has resulted in a unique plateau landscape.
![Espevik](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/tysnes_15.jpg?itok=xW8eH-Lu)
Espevik
220 million years ago, glowing hot molten rock masses intruded into fractures in the earth's crust in the outer parts of Hordaland. Some of these are believed to have reached the surface and formed lava flows, which since have been eroded away by wind and weather. But, most of these flows solidified into diabase sills before they got to the surface.
![The walls in the boathouse in Hopssundet are built of red granite from Reksteren.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/tysnes_25.jpg?itok=_ViluBHW)
![Bordalsgjelet](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/voss_33.jpg?itok=xPd4kUeG)
Bordalsgjelet
Deep down between the stone polished phyllite bedrock in Bordalsgjelet canyon, there is a cascading river. In close cooperation with hard polishing stones, the water has carved into the bedrock for thousands of years - and is still doing so today.
![Bømoen toward the north.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/voss_52.jpg?itok=mV3IWyRp)
![Slopes above the Kårdal boarding house](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/voss_22.jpg?itok=Fvt_DoMF)
![From Helland toward the end of the valley with the Skrikjo waterfall.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/ull_11.jpg?itok=aQL9hvnj)
![Hetlefloten i Os](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/723.jpg?itok=iwhgEn9w)