Cuiyun Corridor in Guangyuan City of Sichuan is also called the Corridor of Royal Cypresses. It was a green corridor on the Shu Roads, a system of ancient mountain roads joining Shaanxi and Sichuan since the 4th century BC. Lined up by nearly 10,000 lush cypresses planted during the Qin Dynasty on both sides, the corridor is so far the oldest and best-preserved ancient land transportation route in the world and thus reputed as the No. 1 Ancient Road in the World and a living fossil of land transportation. Zigzagging for three hundred Li, the corridor consists of three roads stretching from Jiange Ancient Town to Zitong in the west, Zhaohua in the north and Langzhong in the south.
