The calculated distance (air line) between Ambato Boeny and Antsohihy is approximately 138 miles respectively 223 kilometers.
By car or train, the actual journey to Antsohihy is certainly longer, as only the direct route (as the crow flies) between Ambato Boeny and Antsohihy has been calculated here.
Air line (approximately)
223 kilometers
120 nautical miles