animals. Ankang is rich in Chinese herbal medicines, with more than 1290 kinds of species. The output of cocoon, Codonopsis pilosula, tea, raw Chinese lacquer, musk tops Shaanxi and the output of raw Chinese lacquer is well known in China. The development of Chinese herbal medicines mainly on Gynostemma pentaphylla, saponin and puerarin has formed industrial groups with certain size. Ankang's tea has a long production history, which is one of seven major tea-planted areas in China. There are 9 counties or districts produce tea, among which Ziyang, Liping, Hanbin, Langao, Han Yin and Shiquan are the main tea-producing areas. In 2006, the tea garden covered an area of 34.52 million mu in Ankang, with a total output of 4735 tons. Ankang is also the largest silkworm and silk production base in Shaanxi, even in the northwest of China whose cocoon output accounts for more than 80% of Shaanxi Province. Ankang is an important base for forest and animal husbandry. The grassland covers an area of 3,130,000 mu and the theoretical animal number of the grasslands is 3,120,000. The forest area is 1,993 mu and the forest coverage of Ankang is 56.5%. The stumpage has reached 55,540,000 cubic meters, accounting for 20.6% of Shaanxi's. Water resources Ankang has many rivers and rich water resources. It takes up 59.5% of the total water resources in Shaanxi Province and the per-capita share of the water resources is 1.5 times as much as it in China, and 2.6 times in Shanxi. Han River, the biggest tributary of Yangtze River, is 340 kilometers long in Ankang. There are 11 rivers whose drainage area is above , such as Han River, Ziwu River, Wenshui River and so on. The average annual runoff of these rivers in the city is 10,657,000,000 cubic meters and the per-capita share of water resources is 3700 cubic meters. The reserves of hydro energy is theoretically 4,690,000 kW, accounting for 36.8% of the total reserves of hydro energy in Shaanxi Province. Three hydropower stations (Ankang, Shiquan and Xihe) in Han River have been built with installation of 1,100,000 kW. The water area for cultivation is 97000 mu taking up 25% of Ankang's total water cultivation area. The water area of Ankang hydropower station is the biggest man-made water area in Shaanxi Province, which is about 81400 mu. Han River, with crystal-clear and pollution-free water, is the important headwater in the midline