The river Ternoise is one of the small chalk streams that flow from the plateau of the southern Boulonnais and Picardy, via the Canche, into the English Channel. The basin of the Ternoise extends to 342 square kilometres and lies in the southern end of the département of Pas-de-Calais. It’s one of the rivers of the Seven Valleys tourist area. Geography Rising at Ligny-Saint-Flochel, passing through Saint-Pol-sur-Ternoise and joining the river Canche at Huby-Saint-Leu, near to the… (More on Ternoise)