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 production of lace and guipure, occupying 112,000 persons, is carried on mainly in the towns and villages of Haute-Loire and in Vosges (Mirecourt), Rhne (Lyons), Pas-de-Calais (Calais) and Paris.
Its main lines run from Paris to Calais, via Creil, Amiens and Boulogne, from Paris to Lille, via Creil and Arras, and from Paris to Maubeuge via Creil, Tergnier and St Quentin.
Of the coast defences the principal are Toulon, Antibes, Rochefort, Lorient, Brest, Olron, La Rochelle, BelleIsle, Cherbourg,St-Malo, Havre, Calais, Gravelines and Dunkirk A number of the older fortresses, dating for the most part from Louis XIV.s time, are still in existence, but are no longer of military importance.
The Barre granites, like those of Woodbury and Calais (also in Washington county) and part of those of South Ryegate, Kirby and Newark (Caledonia county), are of the biotite type; they are grey, except the stone from Newark, which is pinkish.