The calculated distance (air line) between El-Hamma-Djerid and El Mgarsa is approximately 163 miles respectively 263 kilometers.
By car or train, the actual journey to El Mgarsa is certainly longer, as only the direct route (as the crow flies) between El-Hamma-Djerid and El Mgarsa has been calculated here.
Air line (approximately)
263 kilometers
142 nautical miles