The calculated distance (air line) between Sham Tseng and Choi Wun is approximately 11 miles respectively 17 kilometers.
By car or train, the actual journey to Choi Wun is certainly longer, as only the direct route (as the crow flies) between Sham Tseng and Choi Wun has been calculated here.
Air line (approximately)
17 kilometers
9 nautical miles