Helfaut
Helfaut is a commune in the Pas-de-Calais department in the Hauts-de-France region of France 4 miles south of Saint-Omer, on a geological formation called the "plateau d'Helfaut", which separates the Aa valley to the north from the Lys valley, to the south.
The commune is home to rare and protected species in a heathland landscape, which is unusual for northern France and led to the creation of a nature reserve.