Hagen is a city located in the state of North Rhine-Westphalia in western Germany. It is situated on the southeastern edge of the Ruhr area, approximately 15 kilometers south of Dortmund. The city's geography is defined by the confluence of the Lenne and Volme rivers as they meet the Ruhr river.
As of 2023, the population of Hagen was 197,677. It serves as a significant urban center within the industrial region of the Ruhr.