Caohai Lake (, ''Sea of Grass'' in

Chinese Chinese can refer to: * Something related to China * Chinese people, people of Chinese nationality, citizenship, and/or ethnicity **''Zhonghua minzu'', the supra-ethnic concept of the Chinese nation ** List of ethnic groups in China, people of va ...

) is a natural water-body situated in Northwest

Guizhou Province Guizhou (; formerly Kweichow) is a landlocked province in the southwest region of the People's Republic of China. Its capital and largest city is Guiyang, in the center of the province. Guizhou borders the autonomous region of Guangxi to the ...

southwest China Southwest China () is a region in the south of the People's Republic of China. Geography Southwest China is a rugged and mountainous region, transitioning between the Tibetan Plateau to the west and the Chinese coastal hills (东南丘陵) and ...

. The lake is situated on Weining Mountain, in the outskirts of

Weining County Weining Yi Hui and Miao Autonomous County (; Xiao'erjing: ) is a county of Guizhou, China. It is under the administration of the prefecture-level city of Bijie. Notable attractions include Majie Ethnic Yi Village () and the historic site of Shime ...

. Caohai Village lies directly at the edge of the wetland.

Physical data

The lake originally covered . However, as a result of

drainage Drainage is the natural or artificial removal of a surface's water and sub-surface water from an area with excess of water. The internal drainage of most agricultural soils is good enough to prevent severe waterlogging (anaerobic conditio ...

, cultivation, and climate change during the last few decades, the lake area has contracted to only . Its average depth is and it stands at above sea level.

Caohai Nature Reserve

In 1985, the area around the lake was designated as a

nature reserve A nature reserve (also known as a wildlife refuge, wildlife sanctuary, biosphere reserve or bioreserve, natural or nature preserve, or nature conservation area) is a protected area of importance for flora, fauna, or features of geological or ...

at the provincial level, and in 1992 this was elevated to a national level designation. Cao Hai Nature Reserve is an

Important Bird Area An Important Bird and Biodiversity Area (IBA) is an area identified using an internationally agreed set of criteria as being globally important for the conservation of bird populations. IBA was developed and sites are identified by BirdLife Int ...

. The reserve area is .

Fauna

The lake area is the largest and most important

wetland A wetland is a distinct ecosystem that is flooded or saturated by water, either permanently (for years or decades) or seasonally (for weeks or months). Flooding results in oxygen-free (anoxic) processes prevailing, especially in the soils. The ...

of Southwest China, providing wintering grounds for

black-necked crane The black-necked Crane (''Grus nigricollis'') is a medium-sized crane in Asia that breeds on the Tibetan Plateau and remote parts of India and Bhutan. It is 139 cm (55 in) long with a 235 cm (7.8 ft) wingspan, and it weighs ...

s, the only crane species inhabiting plateaus left in the world. In addition, the lake is also inhabited by 184 bird

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

, including

common crane The common crane (''Grus grus''), also known as the Eurasian crane, is a bird of the family Gruidae, the cranes. A medium-sized species, it is the only crane commonly found in Europe besides the demoiselle crane (''Grus virgo'') and the Siberi ...

hooded crane The hooded crane (''Grus monacha'') is a crane native to East Asia and a frequent migratory bird in Japan. Description It has a grey body. The top of the neck and head is white, except for a patch of bare red skin above the eye. It is one of t ...

white stork The white stork (''Ciconia ciconia'') is a large bird in the stork family, Ciconiidae. Its plumage is mainly white, with black on the bird's wings. Adults have long red legs and long pointed red beaks, and measure on average from beak tip to en ...

black stork The black stork (''Ciconia nigra'') is a large bird in the stork family Ciconiidae. It was first described by Carl Linnaeus in the 10th edition of his ''Systema Naturae''. Measuring on average from beak tip to end of tail with a wingspan, t ...

bar-headed geese The bar-headed goose (''Anser indicus'') is a goose that breeds in Central Asia in colonies of thousands near mountain lakes and winters in South Asia, as far south as peninsular India. It lays three to eight eggs at a time in a ground nest. It ...

golden eagle The golden eagle (''Aquila chrysaetos'') is a bird of prey living in the Northern Hemisphere. It is the most widely distributed species of eagle. Like all eagles, it belongs to the family Accipitridae. They are one of the best-known bird of p ...

eastern imperial eagle The eastern imperial eagle (''Aquila heliaca'') is a large bird of prey that breeds in southeastern Europe and extensively through West and Central Asia. Most populations are migratory and winter in northeastern Africa, the Middle East and South ...

white-tailed sea-eagle The white-tailed eagle (''Haliaeetus albicilla'') is a very large species of sea eagle widely distributed across temperate Eurasia. Like all eagles, it is a member of the family Accipitridae (or accipitrids) which includes other diurnal raptors ...

s, and

ruddy shelduck The ruddy shelduck (''Tadorna ferruginea''), known in India as the Brahminy duck, is a member of the family Anatidae. It is a distinctive waterfowl, in length with a wingspan of . It has orange-brown body plumage with a paler head, while the ...

s. One frog species, ''

Rana weiningensis ''Pseudorana weiningensis'' is a species of true frog endemic to China. It is the only species in the genus ''Pseudorana''. It is also known as the Weining frog or Weining groove-toed frog. Its natural habitats are temperate shrubland, temperat ...

'', is endemic to this area.

References

Lakes of China Lakes of Guizhou Nature reserves in China {{Guizhou-geo-stub