The calculated distance (air line) between Banza Damba and Mbanza Kongo is approximately 68 miles respectively 110 kilometers.
By car or train, the actual journey to Mbanza Kongo is certainly longer, as only the direct route (as the crow flies) between Banza Damba and Mbanza Kongo has been calculated here.
Air line (approximately)
110 kilometers
59 nautical miles