Changde Yuanjiang Tunnel is the largest underwater shield tunnel in Hunan Province, with a total length of 2,240 meters, and other underwater shield tunnels are about 1000 meters. Deyuanjiang Tunnel is also the first tunnel in Yuanjiang.
Yuanjiang City, belonging to Yiyang City, Hunan Province, is located in the northeast of Hunan Province and beside Dongting Lake. The city was established in 522 AD (called Yaoshan County), and changed from 1988 to 10.