Duncan Island covers an area of about 0.43 square kilometers. It was named to commemorate the "Chen Hangjian" who came here in the late Qing Dynasty. It is also an island with a central depression and sandbars around it. It is a curved triangle. The middle of the island is flat, with two shallow lakes and gravel dikes around it. There is water in the middle of the island, but it is not drinkable. At present, the shallow lake has been filled, but some of it still has water. Summer is the breeding ground of mosquitoes, and the bird droppings in the lake area are thick and soft and easy to sink. Because the bank around the lagoon is made of coral gravel, which is very permeable, seawater can penetrate into the shallow lake at high tide, making the lake salty. Today, the gravel dike by the lake is still low, only 2 meters high. Super typhoon can set off huge waves, break gravel dikes and form gaps. In the northwest corner and northeast corner of the island, fishermen once built two small stone temples, which have now been demolished. However, from the Guanyin statue of Ming Longquan kiln enshrined in the small temple in the northwest, we can know that fishermen came here to fish in the Ming Dynasty. The two shallow lakes in the middle of the island are big in the west, round in shape and about 200 meters in diameter, and small in the east, long in shape and about 80 meters long, separated by a low sand embankment. The sandbanks around the island are the highest in the southeast, with 3 ~ 8 * * *, and gradually change to gravel, with a large number, but short-lived and intermittent. The vegetation on the sand embankment is dominated by Elaeagnus angustifolia, which is dense and difficult to cross. There is a coconut tree planted by fishermen near the lowland well, which is 20 meters high. Lianas, such as morning glory by the sea, climb in the forest of Yang Jiao. Because of its large area and good navigation channel, the island is also the transportation center of Xuande Islands and the island, and its geographical location is very important. It was occupied by foreign invaders again and again. 1932 France sent pong to land, 1956 South Vietnam sent troops to occupy it. 1974 65438+ 10 I fought back in self-defense and recovered the island, at the expense of many people. Now a martyr monument has been built on the island to commemorate it. Chenhang Island and Coral Island are located on Yongle Atoll, about 40 nautical miles southwest of Yongxing Island in Xisha. There are busy Nanyang Waterways on the west side, and their geographical location is very important. Atoll is rich in aquatic resources, and it is also a good place for ships to berth for shelter from the wind. In order to facilitate the communication between passing ships and officers and soldiers stationed in the island, China Mobile Hainan Company invested heavily in building mobile communication base stations in Coral Island and Chenhang Island.

Guangjin Island (connected with Chenhang Island) is another small island on the reef plate of Chenhang Island, named after commemorating the "Guangjin Ship" that patrolled the sea in the late Qing Dynasty. The area is very small, and there is a sand mouth connected with Chenhang Island. Low tide can wade through. The distance between the two islands is only 370 meters. Although the area of Guangjin Island is small, its basic part is still protected by beach rocks.

Drummond Island is 0.2 1 km2, which is the southernmost island on the arc reef plate in the northeast of Xisha Islands. There are beach rocks around the island, and the sand bank is 3-5 meters above the sea. The island is oval, 950 meters long and about 420 meters at its widest point. There are sandbars extending to the northeast in the northeast of the island. It is the southernmost island on the arc reef plate in the northeast of Xisha Islands. There are sandbars extending northeast on the northeast side of the island. From the sand embankment to the island's middle lagoon, it is a dense cornucopia jungle, which is difficult to walk and the soil is bird droppings. According to the literature records in the late Qing Dynasty, there are dozens of feet high (about 10 meter) trees here, with folded trunks, numerous branches and leaves, numerous seagulls on the island and black soil. Nowadays, the trees on the island are not as tall as before, and the seabirds have gone. The soil surface layer is the recently accumulated white sand, and the brown seabird manure layer is only 20-40 cm below the sand layer. Because of the shallow sand layer and a lot of bird droppings, there are few springs on this island. There are two small fishermen's temples on this island, one of which is engraved with the word "responsive". 1974, a Song coin engraved with the words "Shengsongyuanbao" was excavated in the white sand layer at the top of the sand embankment in the southeast corner of the island. This Xiaoping coin was cast during Wei Jingzong's reign in the Northern Song Dynasty. According to this, it can be known that the sand dike about 30 meters away from the sea surface has increased by L meters in the past 1000 years. Jinqing Island Reef has a large area and is famous for producing turtles. The turtle gates are concentrated on the west coast of the island. In addition, there is a sea cucumber farm here, which is valuable on the reef plate in the north of the island. Due to the development of river valley system at the outer edge of reef plate, it is convenient for small boats to enter the island. The groove of the reef plate can be used to open deep-water channels and build docks.

Ganquan Island is located at16 30' north latitude and1135' east longitude. It is oval, about 730 meters long and 500 meters wide, with an area of about 0.30 square kilometers, about 8 meters above the sea surface, surrounded by sand dikes, and lower in the middle. There are two wells, and the water is very sweet and can be drunk. There are jatropha curcas and pig excrement beans on the island. There is a shallow pier on the southeast side for small boats to park.

Patel Island 0.3 1 km2. The island is oval, about 900 meters long and 450 meters wide, and the highest point is about 9. 1 meter. There is an inlet in the south of the island and an old pier in the east. Shrubbery and bird droppings are well-developed on the beaches around the island, which is one of the most phosphate-rich islands in Yongle Islands. The existence of guano layer shows that there used to be many trees here. There are also Casuarina and coconut trees on the island, and there is a well in the middle. Next to coconut trees, the water is sweet and drinkable, while the well water in the west is polluted by bird droppings and stinks and can't be drunk. This island has long been developed by our people. Today, the island is full of Qing dynasty porcelain, and there are many daily utensils, such as blue glazed porcelain bowls and cups. There is a small temple in the building, which was built by fishermen in Tanmen, Zhuhai, at the southwest end of the island 1934. There is a stone statue in it. Coral Island: Located about 4 kilometers northeast of Ganquan Island, it is the highest island in Yongle Islands. There is a weather station on the island, and there is a channel on the reef flat in the south of the island for small boats to park.

Geographically, Treasure Island is not included.

And other small coral reefs:

The whole Fukushima is 0.02 square kilometers. All of Fukushima is named after its rich aquatic products. There are rich species of coral reefs here, such as shallow reef-building corals, with as many as 56 species. But the island area is small, 360 meters long from east to west and 240 meters wide from north to south. The sandbars are not wide, so there is not much fresh water on the island. The sandbar in the north is the highest, but it is not obvious in the south of the island. The beach rocks on this island are not well developed, but the sand banks have been protected and fixed. There are depressions in the south of the island, which can be submerged by seawater at high tide. The topography of the island is not high, and the sand ridge is only about l meters above the water. Therefore, it is often considered as a new sandbar that has just come out of the water. In fact, this island was formed as early as the Qing Dynasty. During a typhoon, the shape of the island can still be changed.

Yagong Island is on the southeast side of the vast Senpingtan reef plate, and there is a small island formed by huge point reefs, namely Yagong Island. These islands are mainly composed of reefs with some herbs on them. The island develops on the point reef, and the deep water area is around the island. This kind of reef grows independently in the lagoon, especially in the passage of the "gate", because the water near the "gate" is fast and the wind and waves are big, and plankton are also sent from the open sea or in the lagoon. It is beneficial to the growth and merger of reef heads and the formation of small islands. Yagong Island is just Yinyumen District. The island is crescent-shaped, reflecting the influence of northeast wind on reef development. Yagong Island is 3 kilometers east of Fukushima, with deep water outside the reef and no vast reef plate, so the aquatic products are mainly shellfish, and horseshoe snails, a specialty of the South China Sea, are produced on this island. Because this island is inaccessible, seabirds inhabit it. But there are no trees and sand on the island, so seabirds can't come often, so they can only become the seasonal habitat of seabirds. Antelope Reef Antelope Reef is a small atoll in the southwest corner of Yongle Atoll. The reef plate of this small atoll is also very large, and most of it can be exposed to the water at low tide. This small atoll is triangular and has no estuary. It belongs to a closed atoll. There is a sandbar in the southeast of the reef plate, which is composed of white coral sand and is about 2 meters above the water surface.

Ocean Note: The total area of Yongle Atoll Island 1.67 km2.

Name of Island-Area-Length-Width-Highest Altitude-Wharf

Chenhang Island: 0.43 square kilometers; 1. 13km； 0.37km2m； one

Guangjin Island: 0.035 square kilometers; 0.3 1km； 0.22 km; 1m； not have

Jinqing Island: 0.2 1 km2; 0.80km0.33km5m； not have

Ganquan Island: 0.30 square kilometers; 0.73km0.55km8m； not have

Treasure Island: 0.36 square kilometers; 1.03km； 0.44km8m； one

Coral Island: 0.31km2; 0.82km0.42km9m； one

All Fukushima: 0.02 square kilometers; 0.27 km; 0. 12km； 1m； not have

Yagong Island: 0.0 1 km2; 0.23km0. 1 1km； 1m； not have