Cenota Samula sinkhole in Yucatan, Mexico.
The effects of climate change above ground are well known, but what's happening to underground aquifers which supply most of the world's fresh water?
Banking water ensures a steadier, reliable supply in future.
Banking water minimises the impact of evaporation and means that water can also be recycled from various sources.
Sunrise in the Salinas Valley, an agriculture hub of central California. Depleted aquifers have left once-valuable cropland useless.
Groundwater supplies around the world are under threat as drilling companies bore deeper and deeper wells.
A woman draws water from a hand pumped well in northern Ghana.
Many African countries tend to mismanage their groundwater resources.
Groundwater is used extensively in arid regions like South Africa’s Karoo.
Groundwater is often seen as a resource that never runs out. This isn't true.
Water from an irrigation system sprays flowering cotton plants on the farm of Allen Entz in Hydro, Okla, Aug. 16, 2012.
AP Photo/Sue Ogrocki
The Ogalalla Aquifer is a vast underground lake that irrigates farms across the US Great Plains. It took thousands of years to fill, but human use could drain it in roughly a century.
The more the market is willing to pay, the harder it is to regulate water use.
Residents of a small Victorian town realised that delicious water can be a curse as well as a blessing, when they lost a legal battle to stop a local farmer shipping groundwater to a nearby bottling plant.
Which council has Australia’s best-tasting water?
Every year councils around Australia compete to prove they have the best-tasting tap water in the country.
The future of Perth’s urban wetlands is in doubt.
Perth, unlike Cape Town, faces no prospect of its tapwater running out. But other problems lurk beneath the surface, as the city's drying climate puts increasing pressure on irrigation and wetlands.
Deep dive: water flows from a bore in Birdsville, Queensland.
Groundwater is out of sight, but it shouldn't be out of mind. As cities struggle to cope with drought, we should remember that our largest stocks of water are hidden deep underground.
Drilling for water in the Karoo where one major concern from fracking is that groundwater will be affected in the shale gas extraction process.
A vulnerability map could help assess the risks associated with fracking and groundwater which around 300 towns depend on in South Africa's Karoo.
Firefighting foams used to contain large quantities of PFAAs chemicals, but their use has been phased out.
This week’s ABC Four Corners episode investigated contamination at defence force sites and surrounding aquifers with chemicals called perfluoroalkyl acids or PFAAs. Around 18 sites are reported to be affected…
Drilling a groundwater well by hand, near Lahore, July 2017.
A_noina / Shutterstock
Millions of livelihoods depend on the Indus Basin aquifer.
Water levels in Cape Town fell to 20% of their capacity.
Building resilience in Cape Town's water sector will require addressing risks like climate change, drought and flooding. Stormwater and groundwater are tipped as potential solutions.
Study shows that the availability of springs may have controlled human evolution.
There’s a lot of water beneath our feet.
We know the tides affect the oceans, but it also affects groundwater. If we can understand how, then we can better protect this precious resource.
Thousands of people in Bali have joined a movement to reject land reclamation in Benoa Bay.
Mass tourism in Bali is causing the island to face imminent groundwater crisis.
Sampling is a powerful scientific tool - when it’s used honestly.
Some water researchers are ignoring the evidence offered by sampling if it doesn't fit their preconceived notions. But science should always be honest and open.
Ignited methane gas from the seep on the Condamine River.
Screenshot from Jeremy Buckingham/YouTube
Coal seam gas may not be responsible for a flaming river in Queensland, but it still raises uncomfortable questions.
So much water has gone into groundwater it has slowed rising seas.
Bore image from www.shutterstock.com
There's enough water under the ground to form a lake 100m deep over the earth.