The calculated distance (air line) between Sha Tin and Tuen Mun San Hui is approximately 13 miles respectively 21 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 Sha Tin and Tuen Mun San Hui has been calculated here.
Air line (approximately)
21 kilometers
12 nautical miles