According to Adam of Bremen's description in the Gesta Hammaburgensis ecclesiae pontificum about 1075, it ran from the Elbe river near Boizenburg northwards along the Bille river to the mouth of the Schwentine at the Kiel Fjord and the Baltic Sea.
This route, as described by Adam of Bremen in his Gesta Hammaburgensis ecclesiae pontificum around 1075, followed the Elbe river near Boizenburg northwards along the Bille river to its endpoint at the Kiel Fjord and the Baltic Sea.