The calculated distance (air line) between Arivonimamo and Fenoarivo Atsinanana is approximately 185 miles respectively 297 kilometers.
By car or train, the actual journey to Fenoarivo Atsinanana is certainly longer, as only the direct route (as the crow flies) between Arivonimamo and Fenoarivo Atsinanana has been calculated here.
Air line (approximately)
297 kilometers
160 nautical miles