Input (grade 11): Montreuil or Montreuil-sur-Mer is a sub-prefecture in the Pas-de-Calais department in northern France.
Output (grade 9): Montreuil-sur-Mer (officially, Montreuil) is a commune. It is found in the region Nord-Pas-de-Calais in the Pas-de-Calais department in the north of France.