Which island has the most mainland under it?

Xisha Islands, formerly known as Li Qian Changsha or Zhouqi Island or Jiuruluozhou, are located in the northwest of the South China Sea and the southeast of Hainan Island, and are distributed at15 47' ~17 08' in north latitude and110' in east longitude. The coastline is 518km long. Xisha Islands are distributed in a sea area of more than 500,000 square kilometers, consisting of more than 40 islands, continents, reefs, sands and beaches. Through the water of Xisha, colorful fish, colorful corals and shells, and silver beaches, like sparkling salt, can be seen everywhere. Overlooking the Xisha Islands from the air, the islands and reefs are scattered like pearls in the beautiful South China Sea of the motherland, which is even more beautiful and wonderful. All this, dreamlike and picturesque, made Lan Jianqiong, the stationmaster of Sanya Air Traffic Control Station who has been to Xisha for many times, linger and become the deepest memory in his mind. How did you know there was such blue water in the world until you arrived in Xisha? How can you appreciate the unspeakable beauty without going to Xisha?

330 kilometers away from Sanya and Wenchang.

Xisha Islands, known as "Thousand Miles Changsha" or "Seven Islands" or "Nine Ruluozhou" in ancient times, are located in the northwest of the South China Sea and the southeast of Hainan Island, and are distributed at15 47 ′ ~17 08 ′ north latitude and1kloc-0/60 east longitude. The coastline is 518km long. Xisha Islands are distributed in a sea area of more than 500,000 square kilometers, consisting of more than 40 islands, continents, reefs, sands and beaches. Among the four major islands in the South China Sea, the Xisha Islands have the most land exposed from the sea, including 22 islands and 7 sandbars, with a total land area of about 10 square kilometers and a coastline of 5 18 kilometers. Yongxing Island is the largest, 1.85 square kilometers, and Shidao is the highest, with an altitude of 15.9 meters. The pinnacle of Dongdao Atoll is the only volcanic breccia island in the South China Sea. Lan Jianqiong has been to Xisha many times because of her work. He described the Xisha Islands in his mind to Hainan Daily reporter in poetic language: green reefs are embedded in the deep blue sea, and green islands are embedded in huge reefs. If you overlook the Xisha Islands from the air, this is the most common sight. Slightly different, there are not only islands embedded in reef plates, but also ash sand islands or only large atolls. The islands and reefs of the entire Xisha Islands are rich and complete. The seabed topography of Xisha Islands is the Xisha step on the continental slope in the northern South China Sea, which is a submarine plateau with a water depth of1500-2000m, which is higher than the central deep-sea plain in the South China Sea. There are many coral reefs in Xisha Islands, including 8 atolls, 1 platform reef and 1 reef beach. The dry reef (isolated rock or coral reef below the high tide surface and above the depth datum) covers an area of 65,438 0.836.4 square kilometers, of which the reef flat covers an area of 2,265,438 0.6 square kilometers and the reef lake covers an area of 65,438 0.6 square kilometers.

Beijiao is the first island reef to enter Xisha.

The Xisha Islands are divided into two groups, east and west, with the east longitude 1 12 degrees as the boundary. There are Yongle Islands in the west and Xuande Islands in the east. The Yongle Islands in the Western Group include five atolls, namely North Reef, Yongle Atoll, Yuzhuo Reef, Huaguang Reef and Panshiyu Island, and Taiwan Province Reef in Zhongjian Island. There are 65,438+islands in Yongle Atoll, including Treasure Island, Basket Shazhou Island, Ganquan Island, Coral Island, Quanfu Island, Yagong Island, Yuyin Island, Yinyuzai Island, Xianshe Island, Shiyu Island, Jinqing Island, Chenhang Island and Guangjin Island. Beijiao is the first island reef for fishermen to enter the Xisha Islands, and it is also the only way. However, the reef is a large atoll, which is submerged at high tide, so fishermen who are out to sea for the first time or are inexperienced often hit the reef here, so there are many shipwrecks under the North Reef. Compared with the vicissitudes of the North Reef, the Shiyu waters of Yongle Islands are like a pure land. In July last year, Hainan Daily reporter went to the Shiyu waters of Yongle Islands with the fishing boat "Qiong Qionghai 09039". What a good place! Surrounded by 10 islands and atolls, the whole sea area is a natural lagoon with little wind and waves. The sea is spotless and exceptionally clear.

Seeing the sea on the stone island is another sight.

Dongqun Xuande Islands include three atolls, namely Xuande Atoll, Dongdao Atoll and Langhua Reef, and 1 reef (boiled beach), in which Xuande Atoll includes 65438+ such as Xishazhou, Zhaoshu Island, Beidao, Zhongdao, Nanshao Island, Beishazhou, Zhongshazhou, Nansha Hou, Dongxin Shazhou, Xixin Shazhou, Yongxing Island and Shidao. "Looking at the sea from the commanding heights of Shidao is another scene." Lan Jianqiong said that the sea near the island is crystal clear. Because the water is shallow, the sea water is blue, but far from the reef plate, the water depth suddenly becomes larger and the sea water becomes dark blue. The two blues must be separated, and white waves form at the dividing line, which seems to be the shore in the distance. This shore and the other shore are at arm's length, looming, the sound of waves is absent, and the sea breeze blows my thoughts in the scorching sun. Xuande Atoll and Dongdao Atoll in Xuande Islands are underdeveloped, with only a few reefs. Yongle Atoll is the largest atoll with a large number of islands, a large shallow lagoon and rich fishery resources. It is an important fishery base and fishermen's residence in Xisha.

Yongxing Island is the largest island in the South China Sea.

Yongxing Island is the largest island in the South China Sea, with a length of1.950m from east to west and a width of1.350m from north to south, covering an area of 2. 1 km2, including artificial land such as airport runways. 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, and the coastline is about 8. 1 km long. After years of construction, Yongxing Island has built office buildings, post offices, banks, shops, meteorological stations, ocean stations, aquatic products stations, warehouses, power stations, hospitals and other production and living facilities, as well as roads around the island, airports, docks, planes and ships leading to Hainan Island. "Xisha is a midway station from Hainan Island to Nansha. When the weather is bad, fishermen will drive to Yongxing Island in Xisha together. " Lu Yujing, a fisherman from Tanmen, said. Of all the islands in Xisha Islands, only Ganquan Island has a well that can be directly drunk, which is the only natural fresh water resource in all the islands and reefs of Yongle Islands and Xuande Islands. The water surface of the well is about 4.5 meters away from the surface, the water depth is unknown, the well water is transparent and the water quality is good. The fishermen on the island said that they drank the water from the well all the year round without any discomfort. Xisha, a blue world, is a paradise for Hainong and a paradise in the eyes of the world.