Roubaix d aɣrem n Fransa, tella deg agezdu n Nord, tezga-d deg ugafa n tmurt, tebɛed kan 5 km ɣef tmurt n Biljik. Tesɛa azal n 95,866 n imezdaɣen deg useggwas n 2013, tajumma-s d 13.23 km² .