The calculated distance (air line) between So Kwun Wat Tsuen and Choi Wun is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Choi Wun is certainly longer, as only the direct route (as the crow flies) between So Kwun Wat Tsuen and Choi Wun has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles