Zhongnanshan Tunnel, or
Qinling Zhongnanshan Tunnel in
Shaanxi province,
China, is the longest two-tube road
tunnel in China. It is also the third longest road tunnel overall in the world, after the
Lærdal Tunnel in
Norway and the
Yamate Tunnel in
Japan The long tunnel, crosses under the Zhongnan Mountain (). It opened on 20 January 2007, becoming part of the
Xi'an-
Ankang Highway between the
Changan and
Zhashui counties. The cost to build the tunnel was 3.2 billion
yuan (US$410 million). The maximum embedded depth of the tunnel is 1640 metres below surface level.