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![Gathering place for the barn swallows](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/os_15.jpg?itok=gZf8nJaM)
Ulvenvatnet
Lake Ulvenvatnet is thought to be the most species rich wetlands in the municipality. Despite this, the area is not protected, nor is it likely ever to be.
![The Søvik steading, Os](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/kvh_240-3.jpg?itok=t3eJ427l)
![Drawing: longhouse, Sætre](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/kvh_305-1s.jpg?itok=b8MlF38y)
![Beautiful Demoiselle](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/stord_11.jpg?itok=_LlsvkeN)
![Pøylo](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/190/nvh_310_poylo_150.jpg?itok=qaWbRyvK)
![Purkebolsvatnet](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/vatnet.jpg?itok=V6qF1GL6)
Purkebolsvatnet
Lake Purkebolsvatnet is perhaps western Norway's largest sleeping city - for birds. They come in the thousands, usually in later summer and autumn. The barn swallows alone number 10 000 - 12 000 at their most numerous.
![Os rectory](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/kvh_236xxx.jpg?itok=hO_YXv5o)
![Lyngoksen](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/austr_16.jpg?itok=FU0ZNly2)
![Leirvågen](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/austr_10.jpg?itok=DGquSLwq)
Leirvågen
A marsh is a grassy meadow that is strongly influenced by salt from the sea. This type of nature is abundant in Denmark, among other places. The flatlands along the river that run out by Leirvågen, are the municipalities' largest marsh. At spring tide, these flatlands are flooded underwater for several hundred metres in over land.
![Fløksand - Tidal flats](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/meland_13.jpg?itok=XFwGTS7i)