The calculated distance (air line) between Poste de Flacq and Beau Vallon is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Beau Vallon is certainly longer, as only the direct route (as the crow flies) between Poste de Flacq and Beau Vallon has been calculated here.
Air line (approximately)
29 kilometers
15 nautical miles