Tourists visit the Baotu Spring in Jinan, capital of east China's Shandong Province, Nov. 24, 2015. The water level of the well-known Baotu Spring reached 29.17 meters by Sept. 19, 2016. Since the reactivation of the Baotu Spring in 2003 after the font ran out of streams for 548 straight days, the spring has continuously gushed for 13 years. (Xinhua/Guo Xulei)