By Gia Chinh February 25, 2021 | 08:09 am GMT+7 vnexpress
With the Red River turning a surprisingly clear blue-green shade in its upstream sections, experts have blamed it on dams and polluting factories.

For a week now, the Red River section that flows through Lao Cai Province has become so clear that there are some shallow areas towards the banks where the river bed can be seen at a depth of one meter.
The Red River, over 1,100 km long, originates in China and flows through Lao Cai, Yen Bai, Phu Tho, Vinh Phuc and Hanoi. The river section that flows through Vietnam is about 510 km long.