Flood of 1940
1940 CE.
Shown on the map at 42.396°, 2.599°.
The Flood of 1940 (in French and Catalan "aiguat de 1940") was a Mediterranean episode of extreme rainfall in October 1940 over the uplands of the eastern Pyrenees. It caused devastating floods in the French departments of Pyrénées-Orientales and Aude as well as in Catalonia in Spain.
Text from the Wikipedia article Flood of 1940 in France, licensed CC BY-SA 4.0.