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Wulong is a county at the southeast of Chongqing, the biggest city in China. Wulong is at the cross-section of Daloushan Mountain and Wuloushan Mountain. Well known for its karst geology with various shapes of landscape, Wulong has been a famous scenery spot for centuries. The astonishing natural view such as Three Nature Bridges, The numerous caves have attracted millions of tourists each and every year. Truly, it is a museum of geology and geography without a peer in the universe. The 5th XTRAIL will start on May 3th, 2021, and it will still be in the four groups of 110km, 50km, 28km and 4.5km (family group). Welcome to join us to create the fifth anniversary of Wulong.