Bridge near Doetinchem
|Countries||Netherlands and Germany|
|• location||near Raesfeld, Westphalia, Germany|
|• elevation||55.5 m (182 ft)|
|near Doesburg, in the IJssel, Gelderland, Netherlands|
|5 m (16 ft)|
|Length||81.7 km (50.8 mi)|
|Basin size||1,214 km2 (469 sq mi)|
|• average||10.5 m3/s (370 cu ft/s)|
|• left||Waalse Water|
|• right||Bocholter Aa → Aa Strang, Schlinge (river) → Bielheimerbeek|
The Oude IJssel (Dutch, pronounced [ˌʌudə ˈʔɛisəl], literally old IJssel) or Issel (German, pronounced [ˈɪsəl]) is a river in Germany and the Netherlands approximately 82 km (51 mi) long. It is a right tributary of the river IJssel. Oude IJssel is Dutch for "Old IJssel"; the Oude IJssel was the upper course of the IJssel until the connection with the Rhine was dug, possibly in the Roman era.
Since the moment the Rhine became the largest contributor to the flow of the IJssel, although only a relatively small 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 that consumes tributary rivers instead of giving birth to distributary rivers. The latter only happens at the last part of the river, where the small IJssel Delta is created.
The Oude IJssel begins near Borken in North Rhine-Westphalia, Germany. It flows southwest until it nearly reaches the Rhine near Wesel, then it turns northwest. After Isselburg it crosses the border with the Netherlands and enters the province of Gelderland. It flows through Doetinchem and joins the IJssel in Doesburg.
- Beheersgebied Oude IJssel, Waterschap Rijn en IJssel (in Dutch)
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