In ancient times, Sichuan and Shaanxi were linked by a plank road running between Mingyue Gorge to the south and Qingfeng Gorge to the north of Chaotian Town, some 25 kilometers north of Guangyuan City and bordering on a cliff on the eastern bank of Jialing River. The road was first laid at the dawn of the Qin Dynasty (221-207 BC) and was renovated throughout the successive dynasties.