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Chengmai County is an administrative district in Hainan, the People's Republic of China. It is one of 4 counties of Hainan. Its postal code is 571900, and in 2002 its population was 490,800 people.

The first record of Chengmai County is in 110 BC,when it was called Guo County in one of Emperor Wu of the Han's records; under the Sui Dynasty reorganisation of 607, it was renamed Chengmai County which remains to this day. The county is also mentioned in Ming Dynasty records.



Located in northwest Hainan, Chengmai county is 56 km wide (east to west) and 70 km long (north to south) with a total land area of 2067.6 km². Climate-wise, it is tropical with ample sunshine and moderate rainfall all year round. The average annual temperature is 23.7°C, and the county receives 2060.5 hours of sunshine a year, with 1756 mm of rain per year on average.

With a total land area of 206,700 hectares, melons and other tropical crops are grown around the county.

More than 20 rivers flow through the county, providing 17.4 billion m³ of water per year.



Mining is the main industry, with more than ten resources available including quartz, stone, limestone, crystals, gold, silver, peat, zinc, aluminium, iron ore, kaolin, and manganese. Over 5 billion tonnes of quartz remain unmined in the county, with an average grade of 99.5% silicon. There are also nearly 11 million tonnes of limestone remaining in addition to crystal deposits 5.5 km long and 3 km wide and around 80,000,000 tonnes of kaolin.

Fishing also plays a large part in the local economy, with Chngmai county possessing 89.8km of coastline. Mackerel, redfish, croaker fish, grouper, pomfret, tuna, squid, cuttlefish, lobster and shrimp all are fished in the harbour at Tu Beach. The diverse and populous fish are a result of a nutrient-rich sediment at the bottom of the harbour.


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