The longest rivers in the world stretch over thousands of kilometres. From the Amazon to the Nile, they are crucial to human ...

One-fifth of fish species in the Mekong river face the threat of extinction, according to a new report from a coalition of regional and international environmental groups. The Mekong -- among the ...

No one saw a Mekong giant salmon carp for 15 years, but then the species was spotted in areas of Cambodia that suggest it may be found in more locations. By Rachel Nuwer The Mekong giant salmon ...