No water in the region

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When I started the game there was a lot of water in my region, but now when I switched to other cities where there was a water in valleys. The water was just absent.
I don't understand where the water disappeared?
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What is it called when there is no water in an area?
Physical water scarcity is where there is not enough water to meet all demands, including that needed for ecosystems to function effectively. Arid areas (for example Central and West Asia, and North Africa) often suffer from physical water scarcity.Why is there no water in some places?
More than half the world's wetlands have disappeared. Agriculture consumes more water than any other source and wastes much of that through inefficiencies. Climate change is altering patterns of weather and water around the world, causing shortages and droughts in some areas and floods in others.Where are places with no water?
5 Countries Most Threatened by Water ShortagesWhat is the lack of water?
Wikipedia defines water shortage as, \u201cWater scarcity is the lack of sufficient available water resources to meet water needs within a region. It affects every continent and around 2.8 billion people around the world at least one month out of every year. More than 1.2 billion people lack access to clean drinking water.The Journey Episode 2: Life without Clean Water
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Rodrigo Burgos S., Nothing Ahead, Magic K, Borislav Krustev