The calculated distance (air line) between San Tin and Tsz Wan Shan is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Tsz Wan Shan is certainly longer, as only the direct route (as the crow flies) between San Tin and Tsz Wan Shan has been calculated here.
Air line (approximately)
21 kilometers
12 nautical miles