North of that river the coast is low-lying and bordered by sand-lunes, to which succeed on the Strait of Dover the cliffs in the neighborhood of the port of Boulogne and the marshes and sand-dunes of Flanders, with the ports of Calais and Dunkirk, the latter the principal French port on the NOrth Sea.
The departments with the largest population of foreigners were Nord (191,678), in which there is a large proportion of Belgians; Bouches-du-Rhne (123,497), Alpes-Maritimes (93,554), Var (~7,4~5), Italians being numerous in these three departments; Seine (153,647), Meurthe-et-Moselle(44, 595), Pasde-Calais (21,436) and Ardennes (21,401).
Calais - - - 52,839 50,818 59,623
It is grown largely in the departments of Nord and Pas-de-Calais and in those of the Seine basin, the southern limit of its cultivation being roughly a line drawn from Bordeaux to Lyons.
The latter half of the 19th century, the industry both of cultivation and manufacture being concentrated in the northern departments of Aisne, Nord, Pas-de-Calais, Somme and Oise, the first named supplying nearly a quarter of the whole amount produced in France.
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