Ijssel (Gelderse Ijssel)

   Arm of the river Rhine flowing through the eastern provinces of Gelderland and Overijssel and partly serving as a boundary between the Netherlands and Westphalia (Germany). During the late Middle Ages, the river was an important means of transport for goods with an inland destination. Several com mercial towns were founded along the river, such as Kampen, Zwolle, Deventer, and Zutphen, which were members of the Hansa League.