Saint-Étienne-au-Mont is a commune in the Pas-de-Calais department in the Hauts-de-France region of France near Boulogne-sur-Mer. Saint …Saint-Étienne-au-Mont is a commune in the Pas-de-Calais department in the Hauts-de-France region of France near Boulogne-sur-Mer. Saint-Étienne-au-Mont is about 3 miles south of Boulogne. The Liane river flows from the north of the commune to the south-east. West of Écault is the English Channel.