The calculated distance (air line) between Hang Hau and Tuen Mun San Hui is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Tuen Mun San Hui is certainly longer, as only the direct route (as the crow flies) between Hang Hau and Tuen Mun San Hui has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles