Strombach (Agger)Strombach is a river of North Rhine-Westphalia, Germany. It is a right tributary of the Agger.GeographyThe current's source comes from the northern outskirts of Gummeroth at an elevation of above sea level. NN. The stream then slowly moves in a mostly southern direction through a number of villages including: Gummeroth, Strombach, Hardt-Hanfgarten and Liefenroth around Vollmerhausen at above sea level where it then opens into the Agger.