Engravings in NW China's Qinghai confirmed as 2,600 years old
01:05

Experts confirmed that the rock engravings found along the banks of the Tongtian River in the city of Yushu, northwest China's Qinghai Province, were made 2,600 years ago. This came after the experts checked and examined a total of 51 sites with ancient rock engravings in the Qinghai-Tibet Plateau over the years.