The calculated distance (air line) between Polatsk and Vyerkhnyadzvinsk is approximately 39 miles respectively 62 kilometers.
By car or train, the actual journey to Vyerkhnyadzvinsk is certainly longer, as only the direct route (as the crow flies) between Polatsk and Vyerkhnyadzvinsk has been calculated here.
Air line (approximately)
62 kilometers
34 nautical miles