Especially in the Haine, Sambre and Meuse valleys, between the Borinage and LiÃ¨ge, where there was a huge industrial development based on coal-mining and iron-making, urbanisation was fast.
Hasa katika mabonde ya Haine, Sambre na Meuse, kati ya Borinage na LiÃ¨ge, ambako kulikuwa na maendeleo makubwa ya viwanda kulingana na uchimbaji wa madini ya makaa ya mawe na chuma, ukuaji wa miji ulikuwa wa haraka.