1. The water system composed of many rivers in eastern and southeastern Asia is the water system with the largest runoff in Asia.

Most rivers originate from the central plateau and flow eastward or southward into the marginal seas of the Pacific Ocean, such as the Bohai Sea, the Yellow Sea, the East China Sea, the South China Sea, the Whale Sea, and the Sea of ​​Okhotsk. The main rivers are the Yangtze River, the Yellow River, the Heilongjiang River, the Liaohe River, the Haihe River, the Huaihe River, the Pearl River, the Red River, the Lancang River, the Chao Phraya River, and many island rivers. my country's terrain is high in the west and low in the east, so most of the rivers flow into the Pacific Ocean. Since ancient times, there has been a saying that "the great river flows eastward."

2. The water system composed of some rivers in South Asia, Southeast Asia, and West Asia is mainly South Asian rivers.

Due to the abundant precipitation in South Asia, the total runoff of rivers is very large. The rivers mainly flow from north to south, mainly flowing into the marginal bays of the Indian Ocean, the Bay of Bengal, the Arabian Sea, and the Persian Gulf. The main ones are the Yarlung Zangbo River, the Ganges River, the Indus River, the Nu River, the Irrawaddy River, the Tigris River and the Euphrates River (Arab River). These rivers are of great survival and strategic significance to the countries through which they flow. For example, the water resources of the two rivers often cause conflicts among countries.

Third, the Arctic Ocean water system composed of some rivers in northern Asia is the water system with the largest area.

Most of its basins are located in the temperate continental climate zone, and the ice period is very long. The population along the coast is sparse, and the economic value of the rivers is not high. The main rivers are the Ob River (Irtysh River) originating in the northern border of my country, the Yenisei River and the Lena River in Russia. The runoff of these three rivers is very large. From south to north, they run through Siberia and flow into the Arctic Ocean.

Fourth, the geographical and hydrological characteristics of Asia

Asia is the largest, most populous and most complex continent in the world. The overall terrain is high in the middle and low around. Therefore, most rivers are developed in the central plateau and radiate and meander around.

Asia is vast and breeds long rivers. Six of the world's 10 longest rivers are in Asia: the Yangtze River, the Yellow River, the Ob River, the Mekong River, the Lena River, and the Heilongjiang River.

Four of the world's ten largest rivers are in Asia: the Ob River (Irtysh River), the Yenisei River, the Lena River, and the Heilongjiang River (Amur River). Due to the limitations of the mountains and plateaus, the Yangtze River has a drainage area of ​​only 1.8 million square kilometers, ranking 12th in the world, but its length and runoff rank third in the world.

No major river in Asia originates from the tropical rainforest climate zone, so the runoff is far behind the Amazon River and the Congo River, but there are many rivers in Asia, with an annual runoff of nearly 13,000 cubic kilometers, accounting for 34% of the world's total annual runoff, ranking first among all continents. Asia is the only continent with runoff that flows into the four oceans at the same time. In other words, Asia is in contact with the four oceans, which is something that other continents cannot do.

In my impression, there is Europe between Asia and the Atlantic Ocean, but in fact, the Mediterranean Sea and the Black Sea, which belong to the Atlantic Ocean, are adjacent to Asia. Therefore, there are also rivers in Asia that flow into the Atlantic Ocean system, and the drainage area is very small. The rivers mainly originate from the Anatolian Peninsula of Turkey and the three Caucasus countries. The main ones are the Sakarya River, the Kizil River, the Rioni River, the Kodori River, the Aksu River, and the Asi River. These rivers are very small, with small flows and no reputation. The most important thing is that although the countries to which these rivers belong are located in Asia, they are more culturally and economically inclined to Europe.

The rivers in the inland area of ​​Asia do not flow into the ocean, but into inland lakes or disappear in the desert.

Central Asia is the largest inland area in the world, covering northwest my country, Central Asia, northern West Asia and other regions. The inland area in my country alone is close to 3.5 million square kilometers, which is more than one-third of the country's land area. Central Asia is far from the sea, with little precipitation and strong evaporation, so the inland area is vast. The main inland rivers are the Tarim River, Ili River, Amu Darya River and Syr Darya River. The main inland lakes are Qinghai Lake, Balkhash Lake, Aral Sea, Caspian Sea and Qinghai-Tibet Plateau Lake Area.

Asia has both the largest inland area and the largest no-flow area. No-flow area refers to an area with no perennial surface runoff or only a few seasonal rivers. The Arabian Peninsula is the largest no-flow area, and there are also some no-flow areas between the Caspian Sea and the Aral Sea. There are also small areas of no-flow areas in northwest my country.

The Arabian Peninsula covers an area of ​​more than 3 million square kilometers, with a hot climate and very little precipitation. The peninsula countries are called no-flow countries, and their oil resources are very rich. "Water is more expensive than oil" means here. Saudi Arabia has carried out the world's largest seawater desalination project and even plans to pull glaciers from Antarctica to alleviate water shortages.