The calculated distance (air line) between Sai Kung and Hung Shui Kiu is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Hung Shui Kiu is certainly longer, as only the direct route (as the crow flies) between Sai Kung and Hung Shui Kiu has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles