1. How many transboundary rivers does Vietnam have?

  • 20
  • 23
  • 26
  • 29
Exactly

Vietnam has a dense river system with about 2,360 rivers longer than 10km, of which 93% are short, small, inter-provincial rivers. Many large rivers in the river system can be mentioned such as Tien River, Hau River, Red River, Da River, Dong Nai River... In total, Vietnam has about 23 cross-border rivers.

2. Which river flows through three countries: Vietnam, Laos, and Cambodia?

  • Red River
  • Mekong River
  • Serepok River
  • Sepon River
Exactly

The Mekong River stretches 4,350km, originating from the Tibetan Plateau in China and flowing into the South China Sea. It is the lifeline that feeds tens of millions of people across six countries: China, Laos, Myanmar, Thailand, Cambodia and Vietnam, who live on agriculture and fishing. In terms of length, the Mekong River is the 12th longest in the world and the 7th in Asia, while in terms of water flow, it is the 10th largest in the world.

3. Which province in our country does this river flow into first?

  • An Giang
  • Tay Ninh
  • Long An
  • Tien Giang
Exactly

From Cambodia, the Mekong River flows into Vietnam first in An Giang province, divides into two branches, the Tien River and the Hau River, and then flows into the sea through nine mouths: Tieu, Dai, Ba Lai, Ham Luong, Co Chien, Cung Hau, Dinh An, Ba Thac (Bassac) and Tran De. The nine rivers of the Mekong resemble nine winding dragons, so they are also called the Cuu Long River.

4. How many provinces and cities does this river flow through in Vietnam?

  • 8
  • 9
  • 10
  • 11
Exactly

When entering Vietnam, the Mekong River flows through 9 provinces and cities in the Southwest region including: An Giang, Dong Thap, Tien Giang, Vinh Long, Ben Tre, Can Tho, Hau Giang, Tra Vinh, Soc Trang. The provinces of Vinh Long, Tra Vinh, a large part of Dong Thap and An Giang are located between the Tien and Hau rivers.

Over the years, the two estuaries of Ba Lai and Ba Thac (Bassac) were silted up, built into sluices and dams to prevent saltwater intrusion and disappeared. Therefore, the Mekong River now has 7 estuaries flowing into the sea.

5. Which is the longest inland river in Vietnam?

  • Red River
  • Mekong River
  • Dong Nai River
  • Ma River
Exactly

Dong Nai River is the longest inland river in Vietnam, with a length of 586km and flows through the provinces of Lam Dong, Dak Nong, Binh Phuoc, Dong Nai, Binh Duong, Ba Ria - Vung Tau, and Ho Chi Minh City. According to the book Rivers of Vietnam, Dong Nai River originates from Lam Vien plateau in Lam Dong province. The upper reaches of the river are about 1,770m above sea level and flow in the Northeast - Southwest and North - South direction.

The river has main tributaries including: Da Nhim River, Be River, La Nga River, Saigon River, Da Huoai River, and Vam Co River. Dong Nai River flows into the East Sea in Can Gio District, Ho Chi Minh City.