The calculated distance (air line) between Castro de Rei and Monforte de Lemos is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Monforte de Lemos is certainly longer, as only the direct route (as the crow flies) between Castro de Rei and Monforte de Lemos has been calculated here.
Air line (approximately)
77 kilometers
42 nautical miles