The calculated distance (air line) between Saint-Laurent-du-Maroni and Macouria is approximately 121 miles respectively 195 kilometers.
By car or train, the actual journey to Macouria is certainly longer, as only the direct route (as the crow flies) between Saint-Laurent-du-Maroni and Macouria has been calculated here.
Air line (approximately)
195 kilometers
105 nautical miles