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![The delta at the outflow of Storelvi in Granvinsvatnet.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/gra_1.jpg?itok=er1kEGup)
Granvinsvassdraget
After the ice age, Granvin Fjord reached all the way up under Skjervsfjossen waterfall. Just a thousand years later, as a result of the rising of the land after the ice melted, this whole inner part of the fjord freed itself of the sea and became Granvinsvatnet lake. In spite of this rise in elevation, this waterway is still navigable for fish: Sea trout have wandered into Granvinsvatnet in more recent times and evolved to become freshwater trout. And salmon and sea trout made the journey 13 kilometres up the Storelvi river.
![Herlandsnesjane](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/ost_19.jpg?itok=ziqPLTch)
Herlandsnesjane
Herlandsnesjane, a four-kilometre long peninsula in Lake Storavatnet in the middle of Osterøy, is well known among botanists. Here lies an unusually large and diverse bog.