The calculated distance (air line) between Sheung Shui and Sham Shui Po is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Sham Shui Po is certainly longer, as only the direct route (as the crow flies) between Sheung Shui and Sham Shui Po has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles