The
Sambre River flows into Belgium at Erquelinnes, a long, slender commune of 10,000 hugging the Belgian-French border 30 kilometers southwest of
Charleroi.
Bersillies-l'Abbaye, Grand-Reng, Hantes-Wiheries, Montignies-Saint-Christophe, and Solre-sur-Sambre are boroughs within the municipal district of Erquelinnes.