You may not know: The narrowest river in the world is only a few centimeters wide.

The narrowest river in the world with an average width of only 15 cm, the narrowest point is only 4 cm wide.

1. In which country is the narrowest river in the world located?

• A

  Vietnam

• B

  China

  The Hualai River, on the Inner Mongolia Plateau in northern China, has an average width of just 15cm. At its narrowest point, it is only 4cm wide. It is hard to believe that a river like the Hualai actually exists.

• C

  America

• D

  D

2. How many kilometers long is this river?

• A

  17km

  Hualai River, also known as "Cau Sac River" is about 17 kilometers long.

• B

  18km

• C

  19km

• D

  20km

3. How many years has this river existed?

• A

  7,000 years

• B

  8,000 years

• C

  9,000 years

• D

  10,000 years

  According to Chinese experts, the river has flowed through the Gongger grassland for at least 10,000 years.
  The river originates as an underground spring and flows into Dalai Nur Lake in the Hexigten Grasslands Nature Reserve. Some people argue that the Hualai is too narrow to be considered a river, but the fact is that size is not the distinguishing factor between rivers, streams and creeks.
  Hualai is a permanent body of water, flowing steadily all year round and it has all the constituent elements of a river, such as a clearly defined basin, floodplain grasslands…

4. Which river is the widest in the world?

• A

  Amazon River

  The Guinness World Records confirms that the Amazon River (which flows through Brazil, Colombia and Peru) is the widest in the world. During the dry season, the Amazon is 11 km wide at its widest point. During the rainy season, the river is up to 40 km wide.
  In terms of surface area, the Amazon covers about 110,000 km² during the dry season and up to 350,000 km² during the wet season.
  The Amazon is also the world's largest river by volume. Its total flow is greater than the next 10 largest rivers combined, providing 20% of the fresh water flowing into the Earth's oceans, an average of 209,000 m³ per second.

• B

  Yellow River

• C

  Nile River

• D

  Yangtze River

5. Which river is the longest in Asia today?

• A

  Yangtze River

• B

  Yellow River

• C

  Yangtze River

  According to the Water Resources Administration, the 6,300 km long Changjiang River, also known as the Yangtze River, is in China. It is the longest river in Asia. The river originates in western China and flows eastward into the sea.
  The Yangtze River has many typical rich species such as Chinese crocodiles, paddlefish and dolphins... This is also the main resource serving China's hydroelectric production.

• D

  Red River

Lam Hoang

Source: https://vtcnews.vn/co-the-ban-chua-biet-dong-song-hep-nhat-the-gioi-chi-vai-centimet-ar953822.html