While aquifers can be fed by streams and rivers, they can also exist in places without any visible surface water. And they’re a lot more common than you might think. This gorgeous map from Anna ...

The map itself isn't hard to grasp. The colored areas show the world's largest aquifers — areas which hold deposits of groundwater. The blue ones are doing fine; more rainfall is flowing into ...

The Nature study, published by researchers at McGill and Utrecht University in the Netherlands, offers a map showing the regions where the use of water from these aquifers vastly exceeds the rate ...

The U.S. Geological Survey website has a map of important aquifers in the contiguous United States. Groundwater can be found in a range of different types of rock, but the most productive aquifers ...

Think of the Central Valley aquifer system in California. Or the Indus basin in Pakistan and India. This groundwater is particularly valuable when rain is scarce or during droughts. The map below ...