The losses around the Bay of Danzig were mostly due to very heavy mining operations by the British in 1944. This helped delay the deployment of the XXI boats in late 1944.
4 U-boats were lost in unknown position in the Gulf of Finland. Two of them, U-479 (Oblt. Friedrich-Wilhelm Sons) and U-676 (Kptlt. Werner Sass) are not shown on the map. This map does of course not include the more than 200 U-boat scuttled there in May 1945.
U-boats lost in the Baltic Sea
35 German U-boats lost in the Baltic Sea, almost half of them lost through accidents, see the map below. See the losses in the Kattegat area.
Accidental U-boat losses in the Baltic Sea
Interesting fact about this area is the number of U-boats lost to accidental collisions with other U-boats and vessels. Since this was the main training area for the massive U-boat force build-up during the war accidents can be expected. 15 German U-boat lost through accidents in the Baltic Sea.
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Books dealing with this subject include
Dödens Hav - Östersjön 1945. Wetterholm, Claes-Göran, 2002.