Nile or Amazon? It’s not as straightforward as you think. Let’s untangle the science, measurements, and muddy sources behind ...

But the Citarum River, which at almost 300 kilometers (190 miles) from source to mouth is West Java’s longest river, is considered one of the world’s most polluted water courses.

Map Shows Every River That Flows to the Mighty Mississippi. A new look at the Mississippi’s enormous watershed reveals the true size and strength of the world’s fourth longest river.

But the Citarum River, which at almost 300 kilometres (190 miles) from source to mouth is West Java’s longest river, is considered one of the world’s most polluted water courses. Vast structures of ...