The calculated distance (air line) between Pola de Siero and Pola de Lena is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Pola de Lena is certainly longer, as only the direct route (as the crow flies) between Pola de Siero and Pola de Lena has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles