About an hour's drive south of Calais, the walled town of Montreuil-sur-Mer sits high above the valley of the river Canche.
The river Canche sits below the town of Montreuil-sur-Mer.
mnli hypothesis: The river Canche sits below the town of Montreuil-sur-Mer. 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.