Original: Landrethun-l Ã s-Ardres is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.
Simplified: Landrethun-l Ã s-Ardres is a commune. It is in the region Nord-Pas-de-Calais in the Pas-de-Calais department in the north of France.