World Heritage Site The mountains have been listed since 1999 as a
UNESCO World Heritage Site, for cultural, scenic, and
biodiversity values. The site has a total area of 99,975 hectares that is divided into four core parts. Three are
ecological: the
Nine-bend Stream Ecological Protection Area (36,400 ha) in the centre, flanked by the
Wuyishan National Nature Reserve (56,527 ha) to the west and the
Wuyishan National Scenic Area (7,000 ha) to the east. The fourth, a
cultural preservation area, is the
Protection Area for the Remains of the Ancient Han Dynasty (48 ha), about 15 km to the southeast of the others. These core parts are surrounded by an additional buffer zone of 27,888 ha. Portions of the Wuyishan National Nature Reserve are more stringently protected, as the
Fujian and
Jiangxi Wuyishan Biosphere Reserves on the respective sides of the provincial border, under the UNESCO
World Network of Biosphere Reserves.
Geology The region is part of the
Cathaysian fold system and has experienced high volcanic activity and the formation of large fault structures, which were subsequently subject to erosion by water and weathering. The landscape is characterized by beautiful winding river valleys flanked by columnar or dome-shaped cliffs as well as cave systems. Peaks in the western portion of the Wuyi Mountains typically consist of volcanic or plutonic rocks, whereas peaks and hills in the eastern area are made up of red
sandstone (particularly in the east) with very steep slopes but flat tops (
Danxia landform). Bedrock lithology at Wuyi Shan is dominated by
tuff,
rhyolite, and
granite in the western part. Red
sandstone is common farther east. The elevation ranges from 200 m (656 ft) to 2,158 m (7,080 ft). The terrain is rugged with cliffs and high peaks. There are numerous
caverns in the mountains, some of which have been explored and
opened to the public . The
Jiuqu Xi river (; also Jiuqu River), about 60 kilometers in length, meanders in a deep gorge among these hills. In most places, it is a slow, shallow stream navigable only by small craft like rowboats and canoes. However, the river narrows at one point to just a few metres but a depth of .
Climate The Wuyi Mountains act as a protective barrier against the inflow of cold air from the northwest and retain warm moist air originating from the sea. As a result, the area has a humid climate (humidity 80 to 85%) with high rainfall (annual average 2,200 millimeters in the south-west and 3,200 millimeters in the north) and common fogs. Lower altitudes experience annual temperatures in the range from 12 °C to 18 °C. The area is relatively
pollution free. The Chinese government set up its first air-quality monitoring station in the area on January 31, 2005. Lower elevations have a humid subtropical climate with mean annual temperature around 18 °C (64 °F) and mean annual precipitation of at least 220 cm (86.6 in). Cooler, wetter conditions prevail at higher altitudes and winters can be snowy on the highest peaks. ==Biodiversity==