Yandang Mountains, or Yandang Shan in the broad sense, refers to a coastal mountain range in southeastern Zhejiang province in eastern China, covering much of the prefecture-level city of Wenzhou (from Pingyang County in the south to Yueqing County in the northeast) and extending to the county-level city of Wenling in Taizhou prefecture. The mountain range is divided in two by the Oujiang River, the two parts being the North Yandangshan and South Yandangshan. It is common that "Yandangshan" is used to refer more narrowly to a specific part of the North Yandangshan, an ancient caldera near a small town of the same name. The highest peaks of North Yandangshan are located here, and this is also the main touristic spot. In this article, name "Yandang Mountains" is used to refer the mountain range, and the "Mt. Yandang" to the caldera near Yandangzhen.
The main peak of North Yandangshan, Baigangjian rises 1,150 m (3,770 ft) above sea level (other sources give altitude of 1056 m or 1108 m ). There is a radar station on the peak, which is closed to the public.
In 2004, Yandangshan became National Geological Park and in the beginning of 2005, a member of Global Geoparks Network, with total area of 450 km² The Yandangshan National Forest Park has an area of 841 hectares, covering Mt. Yandang.
Mt. Yandang is known for its natural beauty, arising from its many vertical rock faces and pinnacles, mountain slopes with lush forests and bamboo grooves, streams with clear water, waterfalls and caves. The area also hosts numerous temples and shrines, many of them with a long history; characteristic for the temples is that many of them are built inside caves or in mouths of caves