Anxian county is designated by the county administrative region directly under the central government of Hainan Province

Ding'an County, a county directly under the central government of Hainan Province, is located in the northeast of the central part of Hainan Island, between 110 ° 7 ′ - 110 ° 31 ′ E and 19 ° 13 ′ - 19 ° 44 ′ n, with a total area of 1197 square kilometers. Ding'an County has a tropical monsoon marine climate with mild climate, abundant heat, sufficient sunshine and abundant rainfall. By 2018, Ding'an County has jurisdiction over 10 towns. By the end of 2018, the permanent resident population of Ding'an County was 297600.

In June of the 29th year of Yuan Dynasty (1292), Ding'an County was established; in 1988, Hainan Province was established, which was subordinate to the people's Government of Hainan Province. Hainan East Ring Expressway passes through the east of Dingcheng Town, and Haiyu east line and middle line highway run through the whole territory. Ding'an County is the birthplace of Qiong opera, with the title of the hometown of Chinese folk culture (Qiong Opera). Nanli Lake scenic spot, wenbifeng Taoist cultural tourism area, Hainan tropical bird world, dingyang ancient city (Dingcheng), Jianlong pagoda, Taishi square, Bajiao hall, former residence of Zhang Yuesong, memorial garden of murui mountain revolutionary base and other natural and cultural attractions.

In 2019, the GDP of Ding'an County will reach 10.442 billion yuan, a year-on-year increase of 2.9%. Among them, the added value of the primary industry was 3.702 billion yuan, a year-on-year increase of 1.6%; the added value of the secondary industry was 1.719 billion yuan, a year-on-year increase of 4.3%; the added value of the tertiary industry was 5.021 billion yuan, a year-on-year increase of 3.2%. The ratio of three industrial structures is 35.4:16.5:48.1.

Historical evolution

The origin of the name

In June of the 29th year of the Yuan Dynasty (1292), Dingan county was set up in the south of Qiongshan county to stabilize the region.

Evolution of organizational system

In the first year of Yuanfeng (110 BC) of the Western Han Dynasty, the county belonged to Shendu County, zhuya County, and was located in today's qiongdongtan (near today's Tieqiao); in the third year of the early Yuan Dynasty (46 BC), the county belonged to Zhulu County, and Hepu County.

In the 19th year of Jianwu (43rd year) of the Eastern Han Dynasty, the county belonged to zhuya county and Hepu County.

During the Three Kingdoms period, in the fifth year of chiwu (242), the county belonged to zhuguan county and zhuya county.

In the first year of Taikang in the Western Jin Dynasty (280), the county belonged to zhuguan county and Hepu County.

In 431, the county belonged to zhuguan county and Jiaozhou.

During the reign of Liang Datong (535-541) in the Southern Dynasty, the county belonged to Yazhou and was subordinate to the governor of Guangzhou. The county was located in the north of today's Danzhou. At the same time, Mrs. Xian appeased, and more than 1000 Dongli people were attached to it, and Li and Han lived together.

In 610, the county was under the jurisdiction of Yanlu county and zhuya county.

In the fifth year of Tang Wude (622), the county belonged to Yancheng county and Yazhou; in the first year of Zhenguan (627), the county belonged to shecheng county and Yazhou; in the fifth year of Zhenguan (631), shecheng County belonged to Qiongshan County, Ding'an County belonged to Qiongshan County, with Qiongshan, Fuyun, boliao, Linji and Wan'an counties as Qiongzhou, and the state was governed in Jiuzhou town of Haikou City; in the thirteenth year of Zhenguan (639), Qiongshan was divided into five counties Yanluo County, zengkou county and rongqiong County, Ding'an County belongs to Yanluo County; in the fifth year of Xiantong (864), the county belongs to Zhongzhou, which is subordinate to Nanan Duhufu, and it is located in Lidong, which is in the south of Yanluo county. It has existed for seven years, but there is no County under it; in the twelfth year of Xiantong (871), the county belongs to Qiongshan County, which is subordinate to Qiongzhou.

After the death of the Tang Dynasty, it belonged to the later Han Dynasty in the Five Dynasties.

In the first year of Daguan (1107) of the Northern Song Dynasty, the county belonged to Zhenzhou and belonged to Qiongguan pacification department, and its administrative office was located in Yuling in the east of Limu. At this time, Zhenning County belonged to Zhenzhou in the South and Qiongshan County in the north. In the first year of Zhenghe (1111), the county belonged to Qiongshan county and belonged to Qiongguan pacification department.

In the Southern Song Dynasty, the construction remained unchanged.

Ding'an County was established in the 29th year of the Yuan Dynasty (1292); in the second year of Tianli (1329), Ding'an County was upgraded to nanjianzhou, directly under the Marshal's office of Haibei (now Beihai City, Guangxi).

In the second year of Hongwu (1369), nanjianzhou was changed into Ding'an County; in the third year of Hongwu (1370), the county government moved to dingyang (now Dingcheng) the next year.

It was unchanged in the Qing Dynasty.

During the period of the Republic of China, the government of Ding'an County was set up in Dingcheng, which was subordinate to QiongYa appeasement Committee Office, QiongYa administrative committee, the ninth administrative supervision district of Guangdong Province, and the office of the chief executive of Hainan Special Administrative Region.

In 1950, the people's Government of Ding'an County was subordinate to the Hainan Military and political Commission, and the county government was set up in the old county government of Dingcheng.

In 1951, it belonged to Hainan administrative office.

In December 1958, it merged with Tunchang County and became Dingchang county. The county government was based in Tuncheng.

In May 1961, Ding'an County was restored, and the people's government was stationed in Dingcheng.

In 1985, it was subordinate to the people's Government of Hainan administrative region.

In 1988, Hainan was established as a province under the people's Government of Hainan Province.

administrative division

By 2018, Ding'an County has jurisdiction over 10 towns, 108 villages and 3 farms. The administrative area is 1197 square kilometers. The county government is stationed in Dingcheng.

geographical environment

Location context

Ding'an County is located between 110 ° 7 ′ - 110 ° 31 ′ E and 19 ° 13 ′ - 19 ° 44 ′ n, in the northeast of Hainan Province, on the South Bank of the middle reaches of Nandu River, bordering Wenchang City in the East, Qionghai City in the southeast and south, Tunchang County in the southwest and West, Chengmai County in the northwest, and Haikou City in the north and northeast. The county is 45.50 kilometers wide from east to west and 68 kilometers long from north to south. It covers an area of 1197 square kilometers.

geology

The strata in Ding'an County are mainly Cambrian Tuolie group, Cretaceous upper series Baowan group, quaternary lower Pleistocene Zhanjiang group and Triassic Xinchang group.

The geology of Ding'an County is mainly composed of sand shale, basalt, volcanic limestone, granite and other rocks.

Sand shale is composed of various detrital materials and cements. It was formed in Pliocene of Cenozoic late Tertiary period, 2.2 million years ago. It is the main soil forming parent material of the whole county, mainly distributed in all parts of leiming, Fuwen, pozhai, Xinzhu and juding, and most parts of Longzhou, Dingcheng, Xiangou and Yongfeng. Basalts are olivine basalts formed in the first stage of the tertiary to Quaternary in the late Cenozoic. They were formed 3-4 million years ago and are mostly composed of olivine and pyroxene. They are mainly distributed in the Jinjiling area, including most of Longmen, Huangzhu and Jinjiling farms. The young basalt is volcanic limestone, which is formed later than the first stage basalt. It is mainly distributed in most parts of Lingkou, Hanlin, Longtang and some parts of Longmen. Granite belongs to the fourth stage of Mesozoic intrusive rocks, formed between the early and late Cretaceous, 135 million years ago. Because it is often covered by sand shale deposits, it is mistaken for sand shale. It is mainly distributed in Longtang, Longmen, Hanlin, pozhai and marginal strip in the south of Ding'an County.

Ding'an County, located in the northern part of Hainan Island, belongs to Leiqiong sag in South China fault depression of Huaxia fault block area. It is located in the Pacific geosynclinal fold area, Southeast Coastal fold system and Hercynian maogeosynclinal fold belt.

Fold structure in the territory: fold in Indosinian structural stage only occurs in Hanlin area; fold in Yanshan structural stage is weak; fold in Himalayan structural stage is mostly covered by Quaternary. According to the spatial distribution and orientation of faults, it can be divided into four groups: ne, NW, Sn and EW.

topographic features

The landform of Ding'an County is long in the north and South and narrow in the East and West. The terrain is gently inclined from south to north, forming a posture of high in the South and low in the north, from 512.70 meters above sea level to 15.20 meters below sea level. The geomorphic changes in the whole county are characterized by various types and different causes. There are not only platform and residual Hill landforms composed of sand shale, basalt, volcanic limestone and granite, but also flat terrace landforms formed by shallow sea sediments and river alluvium. In the south, West and Southeast, there are rolling hills, nanniuling with the southern boundary, jiafengling and xipoling in the west, and wugailing in the East, which constitute the high hills (250-500m above sea level) and low hills (100-250m above sea level). The northern part is mostly flat terraces (below 50 meters above sea level), and the northern part of the central part is surrounded by Jinjiling, which forms a landform of crisscross hills and platforms.

Ding'an County can be divided into high hills, low hills, platforms, terraces and water areas, with a total area of 1.766464 million mu. The altitude of high hilly land is between 250-500 meters, covering an area of 5331300 mu, accounting for 3.02% of the total area of the county; it is mainly distributed in the southern areas of Zhongrui, Longtang, Hanlin, Dongfanghong Farm, etc. The altitude of low hilly land ranges from 100 to 250 meters, covering an area of 531.78 million mu, accounting for 30.12% of the total area of the county. It is mainly distributed in Yongfeng, Huangzhu, Longmen, pozhai, Xinzhu, Lingkou, Hanlin, Longtang and other areas. The platform is 50-100 meters above sea level, covering an area of 75006.53 million mu, accounting for 42.49% of the total area of the county, mainly distributed in juding, leiming, Fuwen, Xiangou, Dingcheng and other areas. Terraces are below 50 meters above sea level, covering an area of 372431 mu, accounting for 21.08% of the total area of the county. They are mainly distributed along the Nandu River, Longzhou Township, Dingcheng Town, Xiangou Town, etc. The water area is 5808700 mu, accounting for 3.29% of the total area of the county.

There are 92 mountains and small mountains in Ding'an County and on the border, including 22 on the border. The mountains are mainly distributed in the south, followed by the West and East.

climate

Ding'an County has a tropical monsoon marine climate, which is characterized by mild climate, abundant heat, sufficient sunshine and abundant rainfall. The annual average temperature is 24 ℃, and the annual average daily temperature is 20 ℃

Chinese PinYin : Hai Nan Sheng Sheng Zhi Xia Xian Ji Hang Zheng Qu Hua Ding An Xian