The calculated distance (air line) between Hung Shui Kiu and Choi Wun is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Choi Wun is certainly longer, as only the direct route (as the crow flies) between Hung Shui Kiu and Choi Wun has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles