The calculated distance (air line) between Berck and Paris 13 Gobelins is approximately 113 miles respectively 183 kilometers.
By car or train, the actual journey to Paris 13 Gobelins is certainly longer, as only the direct route (as the crow flies) between Berck and Paris 13 Gobelins has been calculated here.
Air line (approximately)
183 kilometers
99 nautical miles