The calculated distance (air line) between Orahovica Donja and Mrkonjić Grad is approximately 65 miles respectively 105 kilometers.
By car or train, the actual journey to Mrkonjić Grad is certainly longer, as only the direct route (as the crow flies) between Orahovica Donja and Mrkonjić Grad has been calculated here.
Air line (approximately)
105 kilometers
57 nautical miles