Leverkusen

City, North Rhine-Westphalia Land (state), west-central Germany, on the Rhine River at the mouth of the Wupper River, in the Dhünn valley just north of Cologne. Formed in 1930 by the union of the villages of Schlebusch, Rheindorf, and Steinbüchel with the town of Wiesdorf, it is well served by highway and rail and is the site of the Bayer Works (chemicals, pharmaceuticals, and photographic