The calculated distance (air line) between Nova Iguaçu and Barra do Piraí is approximately 31 miles respectively 50 kilometers.
By car or train, the actual journey to Barra do Piraí is certainly longer, as only the direct route (as the crow flies) between Nova Iguaçu and Barra do Piraí has been calculated here.
Air line (approximately)
50 kilometers
27 nautical miles