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In the Bay of Bothnia, there is up to 60 cm thick, mostly rotten fast ice in the northern archipelagos. Off the fast ice in the north and east, there are small areas of very close ice. Outside the Finnish coast between Raahe and Kokkola, there is 10â€“50 cm thick, open to very close and partly ridged ice. Outside the ice edge, there is open water; else it is ice free at sea.
Bundesamt fÃ¼r Seeschifffahrt und Hydrographie (BSH)