The calculated distance (air line) between Essen and Hollogne-aux-Pierres is approximately 88 miles respectively 141 kilometers.
By car or train, the actual journey to Hollogne-aux-Pierres is certainly longer, as only the direct route (as the crow flies) between Essen and Hollogne-aux-Pierres has been calculated here.
Air line (approximately)
141 kilometers
76 nautical miles