Yandang Mountain was a volcano before it was a mountain, and that is the whole reason it looks the way it does. A hundred and twenty million years ago, in the Cretaceous, a rhyolite eruption laid down the rock; weathering since has carved it into peaks, pillars, blocks, caves and cliffs on a scale no ordinary mountain range manages. Geologists call it a museum of landform sculpture, and in 2005 it was made one of China's world geoparks.
It rises in Yueqing, on the coast of southern Zhejiang, part of it spilling into Yongjia county and Wenling city — which is why Chinese travellers talk about 'north, middle, south, west and east Yandang' as five separate ranges, though the scenic area everyone means is Beiyandang, the north one, inside Yueqing. It has 500-odd sights in eight scenic areas, and three of them are the reason people come: Lingfeng, Lingyan and the Grand Dragon Waterfall, together the 'three wonders of Yandang'.
What makes it more than scenery is that it is one of the three mountains of the classic 'three mountains and five sacred peaks' — the three being Huangshan, Lushan and Yandang — and the literary record goes back that far. Xu Xiake, the great Ming traveller, climbed it at twenty-eight, wrote the Yandang Mountain travelogue, and is said to have hauled himself up a cliff on a strip of cloth; Shen Kuo wrote about it in the Dream Pool Essays, and poets from Xie Lingyun — who is supposed to have invented his hiking clogs here — through Tang Xianzu to Kang Youwei have left poems and inscriptions all over the rock.
It is also the reason the mountain is crowded with wuxia fans: the Duanchang Cliff is where, in Jin Yong's 'Return of the Condor Heroes', Xiaolongnü and Yang Guo vow to meet again in sixteen years — and the scenic area leans into it, marking film locations across the sites. Two or three days is right, spring or autumn, and it is a walking destination rather than a viewing one.