The calculated distance (air line) between Forchies-la-Marche and Etterbeek is approximately 28 miles respectively 44 kilometers.
By car or train, the actual journey to Etterbeek is certainly longer, as only the direct route (as the crow flies) between Forchies-la-Marche and Etterbeek has been calculated here.
Air line (approximately)
44 kilometers
24 nautical miles