On the shores of the Baltic it occurs not only on the Prussian and Pomeranian coast but in the south of Sweden, in Bornholm and other islands, and in S.
The fresher enclosed seas include the Malay and the East Asiatic fringing seas with 30 to 34.5 per mille, the Gulf of St Lawrence with 30 to 31, the North Sea with 35 north of the Dogger Bank diminishing to 32 further south, and the Baltic, which freshens rapidly from between 25 to 31 in the Skagerrak to 7 or 8 eastward of Bornholm and to practically fresh water at the heads of the Gulfs of Bothnia and Finland.
and between 8 ° 4' 54" and 12° 47' 25" E., exclusive of the island of Bornholm, which, as will be seen, is not to be included in the Danish archipelago.
The island of Bornholm lies 86 m.
It is only on the island of Bornholm that older formations come to light.