How long is the longest island in Xisha Islands?

Xisha Islands (also known as Gem Island)

Territorial sovereignty: People's Republic of China (PRC)

Administrative jurisdiction: China Southwest zhongsha islands Office.

Geographical location: northwest of South China Sea, southeast of Hainan Island, north latitude15 40'-17/kloc-0', east longitude1113, with Yongxing as the example.

Xisha Islands, one of the four major islands in the South China Sea of China, consists of Yongle Islands and Xuande Islands, with 22 islands, 7 sandbars and more than 65,438+00 reefs and shoals. The main islands are Yongxing Island, Dongdao Island and Zhongjian Island. This large and small coral island group floats in the sea area of 30 thousand square kilometers, beautiful and pure. 1, Yongxing Island: located at16 50' north latitude and1219' east longitude. With an area of 2. 10 square kilometers, it is the largest island in the South China Sea and the capital of Xisha, Zhongsha and Nansha Islands in Hainan Province. The length from east to west is about1950m, and the width from north to south is about1350m, with an area of 2. 10 km2. Flat terrain, about 5 meters above sea level, the highest point is 8.5 meters. There is a sandbar about 870 meters long and about 100 meters wide in the southwest of the island. Tropical plants are flourishing, and trees are everywhere on the island, mainly jatropha curcas, coconut trees and croissants. After 1949, there are office buildings, post offices, banks, shops, meteorological stations, ocean stations, aquatic products stations, warehouses, power stations, hospitals and other production and living facilities on the island. There are roads, airports and docks around the island, and there are flights and ships connecting Hainan Island. The island is a typical tropical scenery with rows of coconut groves and beautiful scenery. Every month, when the supply ship arrives in Yongxing Island, the residents of the whole island will have a two-day holiday and go to the dock to unload materials such as chickens, ducks, pigs, potatoes and cucumbers. These two days are festivals on the island, and people are very happy. The officers and men guarding the island will be replaced every two years, and the staff will be replaced every six months. Domestic water on the island is treated rainwater, which is divided into drinking water and washing water. The airport on the island can take off and land Boeing 737 aircraft, and the dock can dock 5000-ton ships. The center of the island is on Beijing Road. There are neat coconut trees beside the sidewalk, and there are green lawns under the trees. The environment is quite neat. The cultural landscape of the island includes the old turret left by the Japanese army, the recovered monument set up by the Kuomintang and the monument of the South China Sea Islands set up by the people's government, and the traces of history have been clearly preserved.

After nearly 30 years of construction, Yongxing Island has become an unsinkable aircraft carrier. There is a 2,500-meter-long runway on the island, and hard engineering plastics are widely used for large military transport aircraft, early warning aircraft and heavy fighter. Because the soil is mainly coral sand and phosphorus-calcium soil, and the surface hardness is insufficient, the construction is divided into three stages. In the first stage, from 1982, concrete containing metallic materials was shipped from China, an 800-meter-long runway and underground oil depot were built, and the wharf was cast with steel plates. The second stage, 65438-0994, runway expansion, coral reef pouring cement. From the third stage to the year 2000, a large modern underground warehouse will be built to store heavy weapons and fighters. And used to the air defense positions of the entire Xisha Islands. In order to expand the air defense area, the Navy also built an artificial island in Yin Ji Reef, zhongsha islands, and deployed S300 surface-to-air missiles and phased array radar positions on Zhongjian Island and Ganquan Island, which are less than 400 kilometers away from Da Nang, Vietnam, to integrate air-to-air, sea-to-sea and artillery forces. In the air, the air defense network of Xisha Islands consists of 90-type double-barrel anti-aircraft guns and PL9 surface-to-air missiles. Equipped with more than 24 sets of PL9 missile launchers and 48 self-propelled anti-aircraft guns, it can deal with about 48 air targets simultaneously. IBIS search radar has a range of 40 kilometers, 24 frequency points, automatic frequency conversion and strong electronic countermeasures. It can capture and track many batches of low, medium and air targets 10, and integrate 24 photoelectric sensors. Including thermal imaging, TV cameras and laser rangefinders, it can automatically track and range enemy targets all day. In coastal defense, Huanhuan Islands are equipped with C80 1, C802, C30 1 shore-to-ship missiles and 122mm 40 rocket launchers. Covering the sea area within120km. At the same time, a large number of small-caliber guns were deployed and underground. In order to accommodate more combat aircraft in Yongxing Airport, the island-based fighters belonging to HNA Base, including SU27 (mass production batch 3) FC- 1, J 10, JH7 and J8II (refitted), were all converted into foldable wings, and the landing gear was strengthened. At the same time, due to the use of Russian-made engines, the acceleration and deceleration performance is good, and all fighters have strong short-range take-off and landing capabilities to prevent runway air strikes. After being partially destroyed, the above-mentioned aircraft can still take off. At the climax, even the reserve fighters in the underground hangar can take off and land nearly 100 military aircraft at Yongxing Airport.