The Oude IJssel is a river approximately 82 km long, originating near Raesfeld in Westphalia, Germany, and flowing into the IJssel near Doesburg in the Dutch province of Gelderland. After crossing the Dutch border from Germany at Isselburg, the river passes through the municipality of Oude IJsselstreek, continues through Doetinchem, and reaches its mouth at Doesburg at an elevation of roughly 5 meters. The total height difference across the basin is around 50 meters, giving the river a gentle gradient typical of lowland Dutch waterways.

For paddlers, the navigability of the Oude IJssel varies by section. Between Doesburg and Doetinchem, the river supports commercial navigation, indicating deeper and more reliably passable water. From Doetinchem upstream to Ulft, the river is navigable for motorized recreational boating, which suggests it is also suitable for non-motorized craft such as canoes and kayaks along this stretch. Paddlers should be aware that three weirs are present along the river to regulate water levels; these will require portaging and demand careful attention on the water. The river is embanked over long distances, which shapes the paddling environment considerably. The Oude IJssel also frequently overflows its floodplains, so water levels can vary significantly, and high-water periods may affect conditions along the banks and in adjacent areas. Near Ulft, the Bocholter Aa joins the Oude IJssel, marking a notable confluence point along the route.