The Cattegat is divided from the Baltic by the Danish islands, between the east coast of the Cimbric peninsula in the neighbourhood of the German frontier and south-western Sweden.
He says nothing about the inhabitants of these islands, but tells us more about the Jutish peninsula, or Cimbric Chersonese as he calls it.
The statement that he proceeded along the coasts of Europe "from Gades to the Tanais" is evidently based upon the supposition that this would be a simple and direct course along the northern shores of Germany and Scythia - Polybius himself, in common with the other Greek geographers till a much later period, being ignorant of the projection of the Danish or Cimbric peninsula, and the circumnavigation that it involved - of all which no trace is found in the extant notices of Pytheas.
The peninsula (Chersonese or Cimbric peninsula of ancient geography) extends northward, from a line between Lubeck and the mouth of the Elbe, for 270 m.
Several early writers agree in saying that the Cimbri occupied a peninsula, and in the map of Ptolemy Jutland appears as the Cimbric Chersonese.
The Belgae, who were Cimbric in origin, has spread across the Rhine and given their name to all northern France and Belgium (Gallia Belgica).
It thus consists of the southern half of the Cimbric peninsula, and forms the connecting link between Germany and Denmark.