The level of the Gulf of Finland at Kronstadt and of the Gulf of Bothnia at Haparanda should similarly be 15 in.
In the north of the Gulf of Bothnia it is separated from Sweden and Norway by a broken line which takes the course of the valley of the Tornea river up to its sources, thus falling only 21 m.
A regular gentle slope leads from these hills to the Gulf of Bothnia (Osterbotten), forming vast prairie tracts in its lower parts.
From the spinal mountain range a series of large rivers run in a south-easterly direction to the Gulf of Bothnia.
The Dal river, which enters the Gulf of Bothnia near Gefle, is formed of the union of eastern and western branches (Oster Dal, Rivers of Vester Dal) not far from the town of Falun.
