The Ecaillon rises east of Locquignol, at an altitude of 166 metres, in the Mormal national forest. It flows from south-east to north-west.
It flows through the Avesnois and Solesmois districts before entering the southern Valenciennes region. It flows into the Escaut downstream of Thiant, in the commune of Prouvy, at an altitude of 28 metres, after a 33.2-kilometre journey.
Nestled in the Ecaillon valley, the villages of Prouvy, Rouvignies, Monchaux-sur-Ecaillon and Verchain-Maugré offer a pleasant, verdant rural setting, where you can enjoy nature through hiking. Don’t miss out on the other activities on offer in the Ecaillon villages.