A village situated 5 miles (8 km) northwest of Saint-Omer, on the D207 road. "Houlle" is also the name of a small river close to the village, tributary of the Aa, included in the water management plan (fr:SAGE) of the Audomarois region.
Economy
Spirits from grain, flavoured with berries of the juniper tree, are distilled in Houlle, the Genièvre (juniper) of Houlle; this spirit is very close to the Dutch jenever and more distantly related to dry gin. This is drunk with the local speciality, (potjevleesch) and is used to refine Maroilles cheese.