What are the four big islands of China?

China's four major islands are Xisha Islands, dongsha islands, Nansha Islands and zhongsha islands. The following is an introduction about them:

Xisha Islands is one of the four major islands in the South China Sea, which consists of Yongle Islands and Xuande Islands. This large and small coral island group floats in the sea area of more than 500 thousand square kilometers, beautiful and pure. Xisha has been the territory of China since ancient times. In ancient times, it was called "a thousand miles of Changsha" and was the only way for the South China Sea route. As early as the Sui Dynasty, China sent envoys to Malaysia today through the South China Sea, and the I Ching of the Tang Dynasty also arrived in India. In ancient times, merchant ships loaded with ceramics, silk and spices passed through here, so it was also called the Maritime Silk Road. Because it is far from the mainland, the sea water around the Xisha Islands is very clean, with a maximum visibility of 40 meters. Xisha has several kilometers of coral reefs, which is an excellent diving area, and there are various waters nearby. ...

Dongsha islands is the northernmost and smallest of the four islands in the South China Sea of China. It is located about 260 kilometers south of Shantou City and about 3 15 kilometers southeast of the Pearl River Estuary. It consists of Dongsha Island, Dongsha Reef, Nantan and north beach. The reef plate of Dongsha Island is crescent-shaped, and Chaoshan fishermen are also called crescent island, with an area of 1.8 square kilometers and an altitude of only 6 meters. It is formed by the accumulation of biological debris mainly composed of corals. Dongsha Reef is an atoll with two gaps on both sides, forming a north-south waterway. The South Waterway is deep and wide, while the North Waterway is shallow and narrow. Dongsha islands is located in the upper part of the continental slope in the northern South China Sea, and developed on a step surface with a depth of 300 meters. Underwater reefs are dotted with dangerous water conditions, which is unfavorable for navigation. Dongsha Island is lush and there are many coconut trees. Dongsha islands has a tropical maritime climate, which is hot, humid and windy. There are also typhoons passing through the western Pacific Ocean and the South China Sea, which is of great significance to the weather forecast. The meteorological observatory, lighthouse and typhoon observation station on the island were built in the 1920s. In the 1960s, the island was filled with earth to build an airport. Dongsha islands is located at the crossroads of international routes from East Asia to the Indian Ocean and Asia, Africa and Latin America. The routes from Guangzhou and Hongkong to Manila or Kaohsiung, Taiwan Province Province all pass through the nearby waters, which is of great shipping significance. Rich in seafood, it is an important fishing ground in the South China Sea. Rich in soft-shelled turtle, cuttlefish, sea cucumber, shark and shellfish, it is a special product of seaweed and a specific medicine to drive ascaris. Dongshali is a place where fishermen from Fujian, Guangdong and Taiwan, especially those from Zhangzhou, Chaozhou and Huizhou, work and stop their boats. A large number of seagulls inhabit Dongsha Island, and bird droppings with high phosphorus content accumulate several meters thick and are used as fertilizers and medical raw materials. Dongsha islands was called "Luo □" in ancient times and "Nan 'ao Banner" in the early Qing Dynasty, belonging to jieshi town. Dongsha islands has been the territory of China since ancient times, and now it is under the jurisdiction of Guangdong Province.

Nansha Islands, located at the southernmost tip of southern Xinjiang, is an oval coral reef group with the largest number of islands and reefs in the South China Sea. It is located at 3 40' north latitude to1155' north latitude and109 33' east longitude to117 50' east longitude. Xiongnan Beach in the north, Zengmu shoal in the south, Ma Haili Beach in the east and Wan 'an Beach in the west. It is more than 500 nautical miles long from north to south and 400 nautical miles wide from east to west, with a water area of about 820,000 square kilometers, accounting for about two-fifths of the traditional sea area of the South China Sea. It borders Vietnam, Indonesia, Malaysia, Brunei and the Philippines in the west, south and east. Nansha Islands consists of more than 550 islands, continents, reefs, beaches and beaches, but about one fifth of them are exposed to the sea.

The South China Sea Islands are the general names of many islands, sandbars, reefs, shoals and shoals of China in the South China Sea. They are widely distributed. It stretches from north to south 1800 km, with an east-west distribution of about 900 km. * * * There are more than 200 islands, reefs, beaches and beaches. The island starts from Wei Bei Beach near the coast in the north, Wan 'an Beach in the west, Zengmu shoal in the south and Huangyan Island in the east. From north to south, it can be roughly divided into four islands: Dongsha, Xisha, Zhongsha and Nansha.

Nansha Islands: Located at the southernmost tip of the four islands in the South China Sea of China, the islands and reefs are the largest and most widely distributed. The main islands are Taiping Island, Nanwei Island, Zhongye Island, Zhenghe Reef and Wan 'an Beach. Zengmu shoal is the southernmost part of China territory.

Nansha Islands is of great strategic significance. They are located between Cam Ranh Bay in Vietnam and subic bay in the Philippines, and are the maritime transportation hubs from the Pacific Ocean to the Indian Ocean. They are an important international waterway from East Asia to South Asia, the Middle East, Africa and Europe, an important channel for China to open to the outside world and an important barrier for the security of southern Xinjiang. Of the 39 air routes from China to foreign countries, 2 1 passes through Nansha Islands, and 60% of foreign trade transportation passes through Nansha Islands.

Nansha Islands has a tropical maritime monsoon climate, with an average monthly temperature of 25-29 degrees Celsius, abundant rainfall, lush shrubs, numerous seabirds, rich bird droppings, amphibians and various aquatic products. It is the largest tropical fishing ground of marine fishery in China, with 0/55 species of phytoplankton, more than 200 species of zooplankton and 66 species of shellfish. The sea area is rich in mineral resources, including oil and natural gas, iron, copper, manganese and phosphorus. Among them, oil and gas resources are particularly rich, with geological reserves of about 35 billion tons, which is known as the "second Persian Gulf". It is mainly distributed in more than ten river basins such as Zengmu shoal, Wan 'anxi and Beiletan, with a total area of about 4 1 1,000 square kilometers. The oil and gas reserves of Zengmu shoal basin alone are about 1.26 ~ 1.37 billion tons.

Nansha Islands have been the territory of China since ancient times. Nansha Islands are the earliest islands discovered, named, developed, operated, managed and exercised by China.