The calculated distance (air line) between Ma Wan and Tseung Kwan O is approximately 20 miles respectively 33 kilometers.
By car or train, the actual journey to Tseung Kwan O is certainly longer, as only the direct route (as the crow flies) between Ma Wan and Tseung Kwan O has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles