Regen is a town in Bavaria, Germany, and the district town of the district of Regen. Regen is situated on the great Regen River, located in the Ba…Regen is a town in Bavaria, Germany, and the district town of the district of Regen. Regen is situated on the great Regen River, located in the Bavarian Forest. Originally the town consisted of 4 districts: Bürgerholz, Grubhügel, Riedham and St. Johann.