The calculated distance (air line) between Nzassi and Pointe-Noire is approximately 19 miles respectively 30 kilometers.
By car or train, the actual journey to Pointe-Noire is certainly longer, as only the direct route (as the crow flies) between Nzassi and Pointe-Noire has been calculated here.
Air line (approximately)
30 kilometers
16 nautical miles