The river
Helpe Majeure (Helpe Major) runs through the
Nord department, in the
Nord-Pas-de-Calais Region of France. It rises in the municipality of
Ohain, with about a third of its watershed in Belgium, near the town of
Momignies. The river initially marks the Franco-Belgian border as it flows north. Then it turns west and flows for to its confluence north of
Noyelles-sur-Sambre, as a southern tributary of the
Sambre.