Vietnamese scientists have warned of the unusual increase in the depth of two major rivers in the Mekong Delta, with sand mining and hydropower dams said to be the cause.
According to experts, instead of being accreted, the 250-kilometer long Tien (Front) River and 200-kilometer Hau (Back) River have become five to seven meters deeper since 2008.
The Mekong separates in Phnom Penh into the Tien River, the main northern branch, and the Hau River, the primary southern distributor, after entering Vietnam.