西區海底隧道
Kowloon is connected to Hong Kong Island on the mainland by two road-only tunnels (the Cross-Harbour Tunnel and the Western Harbour Crossing), two MTR railway tunnels (Tsuen Wan line and Tung Chung line/Airport Express) and one combined road and MTR rail link tunnel (Eastern Harbour Tunnel, containing the Tseung Kwan O line and road traffic in separate parallel conduits). No bridges connect the island and Kowloon.