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The Baltic Sea has a very high amount of sea
traffic, and some of the main shipping routes pass right through
important seabird feeding - and very close to important breeding
areas. To the west of the Karlsö Islands, there is a shipping
route where 15 000 ships pass every year. Close to Hoburg (outside
Gotland's southern tip) there is another even bigger route with
40 000 ships per year. The Karlsö Islands have the Baltic Sea's
largest colonies of Razorbills and Lesser Black-backed Gulls, and
2/3 of the Swedish Common Murre population. A large oil spill close
to one of the islands during breeding season could have dire consequences.
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In swedish 
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