The calculated distance (air line) between Tuen Mun San Hui and Sai Wan Ho is approximately 18 miles respectively 28 kilometers.
By car or train, the actual journey to Sai Wan Ho is certainly longer, as only the direct route (as the crow flies) between Tuen Mun San Hui and Sai Wan Ho has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles