The calculated distance (air line) between Chernihiv and Svyetlahorsk is approximately 102 miles respectively 164 kilometers.
By car or train, the actual journey to Svyetlahorsk is certainly longer, as only the direct route (as the crow flies) between Chernihiv and Svyetlahorsk has been calculated here.
Air line (approximately)
164 kilometers
88 nautical miles