The San Pedro Mezquital River is the last free-flowing river in Mexico’s western Sierra Madre.
Thousands of hydropower dams are under construction around the world. New research shows that by cutting off sediment flow, these dams can have big ecological effects on far-off bays and deltas.
Zambezi river delta, snapped by Landsat 8 in March 2018.
Satellites hundreds of miles overheard are helping scientists to predict drought, track floods and see how climate change is changing access to water resources.
The source of the Yamuna River, one of the major rivers draining the Himalayas.
A new report predicts that one-third of the ice in the Himalayas will melt, even if we contain global warming to 1.5C. So what does that mean for the flood-prone valleys below?
A dry river bed in south Australia.
Freshwater fish are suffering as drought becomes more common and severe. Whether they survive will depend on how governments manage rivers and lakes, and on taking action against climate change.
The map that went viral.
Maps can show "the big picture" to lots and lots of people in an engaging and colourful way.
Media reports tend to focus on people who drown at the beach. But almost as many people drown in rivers and lakes. Where are the safety messages for them?
Migrants are no more at risk of drowning than Australian-born swimmers but you'd never know from media reports.
Marshes at Blackwater National Wildlife Refuge on Maryland’s Eastern Shore.
Marshes, swamps and other kinds of wetlands provide valuable services, such as effective natural flood control. But they are being destroyed for development in many parts of the world.
Biscuit Brook, a popular fly fishing spot in New York’s Catskill Mountains.
The Trump administration wants to end federal protection under the Clean Water Act for many small streams and wetlands. But as a geoscientist explains, these are critical parts of large river systems.
Spawning sockeye salmon make their way up the Adams River near Chase, B.C.
THE CANADIAN PRESS/Jonathan Hayward
Populations of freshwater species are in a state of deep decline. But we know why and we can reverse the trend.
Sheep grazing on the Darling River bed.
A decade of bipartisan research has provided plenty of answers to the problems plaguing the Darling River.
Puddles in the bed of the Darling River are a sign of an ecosystem in crisis.
Mass fish deaths are a blaring warning sign for the heath of the Murray Darling Basin, but just as worrying is the sight of dry areas in the Darling.
Going all the way back: rules for the Murray Darling Basin are in Australia’s constitution.
Public confidence in the institutions in charge of the Murray Darling Basin has plummeted – with good reason.
An aerial photo of a 2009 algae bloom in the Murray Darling Basin.
MINISTER PHIL COSTA'S OFFICE/AAP
Algae blooms have killed hundreds of thousands of fish in the last two weeks, but what exactly are they and how do we get them under control?
Children in the Willows forest nature program in the Humber Valley in west Toronto are drawn to water and sticks, simple materials for exploring and investigating. Here the children explore water accumulated from spring rains.
When parents walk in the forest with their children and us and see how children are drawn to spiral snails, together we see how connections with the land are critical for the Earth's future.
Thanks to their consumption of invertebrates, Melbourne platypus likely receive half the recommended human dose of anti-depressants every day.
Pharmaceuticals were found in every invertebrate sampled from six Melbourne streams - including a waterway in a national park.
Volunteers prepare to take flow measurements on Muddy Creek.
Centre County Pennsylvania Senior Environmental Corps
When people form local networks to take care of resources such as drinking water, they strengthen their communities. Technology can support these efforts and promote learning and innovation.
A street sign sticks up from floodwaters after Hurricane Florence in Nichols, South Carolina, September 21, 2018.
AP Photo/Gerald Herbert
Hurricanes frequently move inland in the southeast US, causing widespread river flooding, but emergency plans focus on protecting people in coastal communities.
A river in Van Diemen’s Land, charted during Nicolas Baudin’s 1802 journey.
National Library of Australia
Today, many Australian urbanites see rivers as little more than picturesque places for a paddle. But in the colonial era, rivers served as highways, drinking sources, sewers, and routes to discovery.
Flooding in Kinston, North Carolina during Tropical Storm Florence, September 14, 2018.
NC National Guard
Widespread flooding in North Carolina from Hurricane Florence shows the need for better advance planning in inland areas of the south and mid-Atlantic, especially near rivers.
Farm near Seven Springs, North Carolina, surrounded by water on Oct. 25, 1999, nearly six weeks after Hurricane Floyd.
AP Photo/Karen Tam
Hurricanes in the southern US have caused widespread damage inland in recent decades, mainly through river flooding. But evacuations and stormproofing focus almost entirely on keeping people safe on the coasts.