Regen is a town in Bavaria, Germany, capital of the district of Regen. It is situated on the Regen River, from which it takes its name. Regen has 12,417 inhabitants (2003). The Free State of Bavaria (German: Freistaat Bayern), with an area of 70,553 km² (27,241 square miles) and 12. ... Regen is a district in Bavaria, Germany. ... The Regen is a river in Bavaria, Germany. ...