The calculated distance (air line) between Agios Ioannis Rentis and Maroúsi is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to Maroúsi is certainly longer, as only the direct route (as the crow flies) between Agios Ioannis Rentis and Maroúsi has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles