its magnificent cathedral, Bonn, Castle Arenfels, Koblenz, and Rüdesheim, where it joins the Main River and heads east to Frankfurt-on-Main and points east. As a map is a rectangular sheet of paper and a river is a narrow portion wending its way as geography takes it. This is much more than a simple river map. It is a detailed portrayal of a very interesting part of Europe, extending far beyond the banks of the river, and is ideal for those travelling by car, by train, or by river boat. A detailed city centre map of Frankfurt is included.