The calculated distance (air line) between Dzyarzhynsk and Navapolatsk is approximately 140 miles respectively 226 kilometers.
By car or train, the actual journey to Navapolatsk is certainly longer, as only the direct route (as the crow flies) between Dzyarzhynsk and Navapolatsk has been calculated here.
Air line (approximately)
226 kilometers
122 nautical miles