On Truong Sa and Song Td Tay Islands are meteorological stations. These stations provide daily data concerning weather to the World Meteorological Network. On some islands, such as Song Td Tay, An Bang and Da Tay there are lighthouses of the Viet Nam Corporation of Maritime Security. The soil on Truong Sa‘s islands is made from a mixture of coral sand, guano and humus of a thickness of 5-10 centimeters. Some islands contain underground water, for instance Truong Sa, Song Td Tay and Song Tu Dong. There are a variety of green trees such as Heliotropium foertherianum, Casuarinaceae, Terminalia catappa trees, vines and weeds.
Sources of the sea products of Trdbng Sa are very diversified. In the Trdbng Sa Sea fish types live in dense concentration. The valuable sea tortoise lepidochelys olivacea and tuna fish also live in this sea.
lire climate and weather of Trdbng Sa Sea are greatly different from that of coastal areas. Summer is cooler and winter is warmer. Some weather occurrences that take place differ from that on the mainland. Each year in Truong Sa archipelago there are as many as 131 days of strong wind of the 6th level or more. But strong winds do not blow equally each month. There are two seasons, dry and rainy, in a year. The rainy season lasts from May to January. The annual average rainfall is very large. Thunderstorms occur very frequently, every month, all year long. Tropical storms also often sweep through Truong Sa, mainly in the rainy season.
Hoang Sa and Truong Sa archipelagos are located almost in the middle of the East Sea so they have strategic significance in terms of national defense and security. Hoang Sa and Truong Sa are rich in natural resources beneficial for the economic development of the country. They are within a sea region where important navigation and airline arteries of the world and Southeast Asia cross. Five of the ten largest sea routes of the world are related to the East Sea. These are the routes going from Western Europe and North America to India, East Asia, Australia and New Zealand through the Mediterranean, Suez Canal and Middle East. The North Pacific navigation route from the west of North America to East Asia and Southeast Asia and the route from East Asia to Australia and New Zealand, and several other routes to the Middle East, cross the sea area where Hoang Sa and Truong Sa archipelagos are located. The economies of many countries of East Asia such as Japan, South Korea and Singapore essentially depend on these navigation routes.
Vietnamese scientists have lately revealed that in the sea of Trddng Sa there are 18 families of sea products, including 32 genera and 37 species. There are 13 fish families and 14 fish species, of which are highly valuable species like thunnus albacares (yellow fin tuna), thunnus obesus (big eye tuna) and canthocybium solandri. There is a great reserve of coral that is raw material for refined artistic products and medicinal products.
Moreover, the seabed of Hoang Sa and Trddng Sa archipelagos also contains a huge reserve of oil and mineral ores, multi-metal sulfate and iron-manganese gravel. Many scientists and international science bodies have predicted that the East Sea contains about 130 billion barrels of oil and natural gas, so it is regarded as “the second Persian Gulf”. The Truong Sa Sea area is said to have a reserve of six billion barrels of oil and natural gas (in which gas accounts for 70%).
The UN Convention on the Law of the Sea in 1982, of which Viet Nam is a member, regulates that a coastal state has sovereignty, sovereign rights and jurisdiction over a sea area many times larger than the area of land territory. It has rights to control maritime routes, to master all the strategic defense positions and marine resources and underground of the seabed. That is why Hoang Sa and Truong Sa archipelagos are a flesh and blood part of Viet Nam.

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