| Raging Neisse | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Poland |
| Subdivision Type3: | Region |
| Subdivision Name3: | Lower Silesian Voivodeship |
| Length: | 51 km |
| Source1 Location: | Origin: Confluence of two streams on the western side of the Kokosz in the Waldenburg Mountains |
| Mouth Location: | near Dunino (Dohnau, municipality of Krotoszyce) into the Kaczawa |
| Waterbodies: | Lakes: Słup Lake |
| Custom Label: | References |
The Raging Neisse[1] (Polish: Nysa Szalona, or Jauersche Neiße) is a river in Poland. It has a length of about and flows into the Kaczawa (Katzbach), which in turn flows into the Oder. Its largest tributary is the Little Neisse.
The Raging Neisse rises at a height of on the western side of a mountain called the Kokosz on the Waldenburg Heights. It flows down through the lowlands among the foothills of the Sudetes and the heights of Hainau, through the towns of Bolków (Bolkenhain) and Jawor (Jauer). It then merges with the Kaczawa (Katzbach) at a height of not far from Jawor near the village of Slup (Schlaup) on the battlefield of the Battle of Katzbach.
During heavy rain and due to its mountainous character, the water level of this small river can rise by up to 2.5 metres or about 8 feet, whence its name, the "Raging" Neisse.
The river became famous as a result of the Battle of Katzbach when fleeing French troops being pursued by Marschall Blücher were driven into the Katzbach and Raging Neisse rivers which were swollen as the result of a thunderstorm.