About an hour's drive south of Calais, the walled town of Montreuil-sur-Mer sits high above the valley of the river Canche.
Montreuil-sur-Mer is very far from any natural body of water.
mnli hypothesis: Montreuil-sur-Mer is very far from any natural body of water. premise: About an hour's drive south of Calais, the walled town of Montreuil-sur-Mer sits high above the valley of the river Canche.