کانش

The river Canche (; ) is one of the rivers that flow from the plateau of southern Boulonnais and Picardy, into the English Channel, of which the Somme is the largest example. It is long. The basin of the Canche extends to and lies in the south of the département of Pas-de-Calais. Forming an alluvial valley from wide, the Canche valley also contains marshes, meadows and small woods. The gentle gradient, averaging 1.5 percent, gives the river a meandering course.