It thus serves as an entrepot for much of the commerce between Atlantic and Pacific ports, and between the interior towns of Central and South America and the cities of Europe and the United States.
I'm checking ports of entry for vehicles that made that crossing.
To the north as far as the rocky point of St Gildas, sheltering the mouth of~he Loire, the shore, often occupied by salt marshes (marshes of Poitou and Brittany), is low-lying and hollowed by deep bays sheltered by large islands, those of Olron and Re lying opposite the ports of Rochefort and La Rochelle, while Noirmoutier closes the Bay of Bourgneuf.
North of that point a line of high cliffs, in which occur the ports of Fcamp and Dieppe, stretches nearly to the sandy estuary of the Somme.
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.