The calculated distance (air line) between Yuen Long San Hui and Cheung Chau is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Cheung Chau is certainly longer, as only the direct route (as the crow flies) between Yuen Long San Hui and Cheung Chau has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles