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Name: Boulogne-sur-Helpe topographic map, elevation, terrain.
Location: Boulogne-sur-Helpe, Avesnes-sur-Helpe, Nord, Hauts-de-France, France métropolitaine, 59440, France (50.05460 3.86439 50.09795 3.91588)
Average elevation: 558 ft
Minimum elevation: 472 ft
Maximum elevation: 702 ft