泸定桥
Simple suspension bridges using iron chains are also documented in Tibet and China. One bridge on the upper Yangtze dates back to the 7th century. Several are attributed to Tibetan monk Thang Tong Gyalpo, who reportedly built several in Tibet and Bhutan in the 15th century, including Chushul Chakzam and one at Chuka. Another example, the Luding Bridge, dates from 1703, spanning 100 m using 11 iron chains.