Five kilometers west of Jianshui , at the confluence of Lujiang River are the Tachong River, lies Shuanglong Bridge. A combination of science and art, the stone bridge ranks first in Yunnan Province in terms of size and artistic value. It is now under provincial protection. When the bridge was built during the reign of Emperor Qianlong in the Qing Dynasty, it had only three arches on the north end. Later on, as the Tachong River changed its course, fourteen new bridge arches were added to the original ones and thus got the name "the Seventeen - Arch Bridge''. It is a masterpiece among ancient bridges in China.