Guben (Polish and Sorbian: Gubin) is a town on the Lusatian Neisse river in the state of Brandenburg, Germany. Located in the Spree-Neiße district, Guben has a population of 20,049. Along with Frankfurt (Oder) and Görlitz, Guben is a divided city on the border between Germany and Poland, having been separated into Guben and Gubin in 1945 by the Oder–Neisse line.