5. The Mekong River
Depth-100 meters or 328 ft
The Mekong River, famous for its rich biodiversity with 20,000 plant species, is 2,700 miles long and it is the longest river in the Southeast Asian area. The countries it flows through include China, Laos, Thailand, Cambodia and Vietnam. The basin of the Mekong River covers 795,000 square km.
