The calculated distance (air line) between Sebastopol and Poste de Flacq is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to Poste de Flacq is certainly longer, as only the direct route (as the crow flies) between Sebastopol and Poste de Flacq has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles