Oude IJssel
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Oude IJssel (the Dutch name) or Issel (the German name) is an approx. 80 km long river in Germany and the Netherlands. It is a right tributary of the river IJssel. The Oude IJssel was the upper course of the IJssel (Oude IJssel means Old IJssel in Dutch) until the connection with the Rhine was dug, possibly in the Roman era.
Since that moment the Rhine became the largest contributor to the flow of the IJssel, although only a relatively low amount of the total Rhine flow made its way into the IJssel system. Various tributaries can sometimes add quite some water to the total flow of the river, for example the Berkel and the Schipbeek. The IJssel river is the only branch of the Rhine Delta who consumes tributary rivers instead of giving birth to distributary rivers. The latter only happens at the very last part of the river, where the small IJssel Delta is created.
The source of the Issel is near Borken in North Rhine-Westphalia, Germany. First it flows south-west until it nearly reaches the Rhine near Wesel, then it turns north-west. After Isselburg it crosses the border with the Netherlands (province Gelderland). It flows through Doetinchem and joins the IJssel in Doesburg.
From the left: Vorderrhein | Thur | Töss | Glatt | Aare | Birs | Birsig | Ill | Sauer | Lauter (Wieslauter) | Queich | Speyerbach | Rehbach | Isenach | Eckbach | Eisbach | Pfrimm | Selz | Nahe | Moselle | Nette | Brohlbach | Ahr | Erft |
From the right: Hinterrhein | Landquart | Ill | Dornbirner Ach | Bregenzer Ach | Argen | Schussen | Radolfzeller Aach | Wutach | Murg | Wehra | Wiese | Elz | Kinzig | Rench | Acher | Murg | Federbach | Alb | Pfinz | Kraichbach | Saalbach | Neckar | Weschnitz | Modau | Main | Wisper | Lahn | Wied | Sieg | Wupper | Düssel | Ruhr | Emscher | Lippe | Oude IJssel/Issel | Berkel | Schipbeek