Canche

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Canche
The Canche at Montreuil-sur-Mer.
Origin	Pas-de-Calais
Mouth	English Channel
Basin countries	France
Length	96 km
Avg. discharge	12.1 m³/s
Basin area	1,274 km²

The Canche at Frévent, south of St. Pol. The tail race of the Moulin Blondel.

The river Canche is one of the small chalk streams which flow from the plateau of the southern Boulonnais and Picardy, into the English Channel. The Somme is the largest example. The basin of the Canche extends to 1,274 square kilometres and lies in the southern end of the département of Pas-de-Calais. Its mean gradient is 1.5‰.

The river rises at Gouy-en-Ternois and passes Frévent, Hesdin, Montreuil-sur-Mer before leaving the chalk to flow to the modern coast between Étaples and Le Touquet-Paris-Plage. Its principal tributaries ar the Ternoise, the Planquette, the Créquoise, the Bras de Bronne, the Course, the Dordogne (not the famous river) and the Huitrepin which lie on its right bank that is, to the north of the Canche. The lie of the land leaves no notable tributary from the south until the Grande Tringue, which flows from the former marsh into the small straightened estuary.