These turtles move tens of kilometres along rivers in order to find large sandbars on which to nest.
Interview with Charles Eggert about the Eggert-Hatch River Expedition, a water journey down the Green & Colorado Rivers, in order to make a documentary film.
In other parts of the United States, relatively small dams (most notably the Edwards Dam across the lower Kennebec River in Maine) have been removed from rivers in order to help revitalize spawning fish populations.
As water companies and farmers need to abstract water from rivers in order to maintain supplies and keep crops growing, less is available for streams, wetlands and other areas where wildlife normally flourishes.
This sparsely populated region in southern Chile, called Aysén, is also one of the most endangered, threatened by plans to dam two of the region's rivers in order to send hydro power north along thousands of miles of power lines.
Scientists are using a laser mapping system called lidar to map the run and topography of streams and rivers in order to help maintain fish populations.
The agency has been accused of failing to dredge rivers in order to protect the Somerset Levels, where villages such as Muchelney have been cut off for almost a month and about 11,500 hectares (28,420 acres) are flooded.
The Austro-Hungarians declared war on Serbia on 28 July and that same day the Serbs destroyed all bridges on the Sava and Danube rivers in order to prevent the Austro-Hungarians from using them during any future invasion.
In early June of 1774, Lord Dunmore further commissioned McDonald as a ranking military officer of an expedition (known as "McDonald's Expedition") to promptly organize and recruit settlers west of the Allegheny Mountains along the Youghiogheny and Monongahela rivers in order to defend European American settlements from Native American attacks.
We launched our kayaks in Wyoming's Wind River Mountains in early October, setting out to travel the entire length of the river in order to learn more about the river system that supplies 30 million people in the American Southwest with water.
Steamboat pilots had to memorize or cunningly estimate the depths and potential obstacles along long stretches of river in order to navigate safely.
