Erquelinnes is a Walloon municipality located in the Belgian province of Hainaut. On 1 January 2006 Erquelinnes had a total resident population of 9,549. The total area is 44.23 km2 (17.08 sq mi) which gives a population density of 216 inhabitants per km².The municipality consists of the following sub-municipalities: Erquelinnes proper, Bersillies-l'Abbaye, Grand-Reng, Hantes-Wihéries, Montignies-Saint-Christophe, and Solre-sur-Sambre.