Herdecke is a town in the district of Ennepe-Ruhr-Kreis, North Rhine-Westphalia in Germany. Its located south of Dortmund in the Ruhr Area and is known as Die Stadt zwischen den Ruhrseen (lit. The city between the Ruhr lakes). The city is located in the area of the Regionalverband Ruhr (RVR). The two Ruhr lakes Hengsteysee and Harkortsee as well as the forests on the Ardey heights make the town attractive to tourists.