Cypress and cedar trees in Japan are causing massive amounts of nitrogen runoff into local streams.
Each year American Rivers names 10 of the most threatened waterways in the United States. This year the river flowing through one of America's most iconic landmarks tops the list.
The controversy over construction of Nicaragua's Interoceanic Grand Canal makes it a good time to look at the some of the biggest man-made waterways on the planet.
More than 50,000 gallons of oil spilled into Montana's Yellowstone River after a pipeline burst.
A vast ancient canyon lies buried underneath a present-day river that cuts through the Himalayas in Tibet.
A gorge formed by an earthquake and a violent river arrived quickly and could be gone in 50 years.
A river in China that's normally unpolluted suddenly turned blood red one morning last week.
A new way to predict when rivers are about to flood comes from outer space.
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