NATIONAL GEOGRAPHIC | Two-thirds of the longest rivers no longer flow freely—and it's harming us

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Published: 9May2019

A new study warns that many of the benefits rivers provide, from water to food to flood control, are increasingly at risk thanks to dams and diversions.

Using satellite imagery and other data, the team of 34 international researchers mapped 7.5 million miles of rivers worldwide. “It’s the culmination of more than a decade of data processing and preparation,” says Günther Grill, a McGill University geographer and lead author on the study, which published Wednesday in the scientific journal Nature.

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