Gravity pulls water down, and because water is a liquid it can flow between the particles of soil. So it tends to seep into the ground and keep falling down lower and lower until it hits rock that it cannot flow through. It then builds up above that rock in what is called an aquifer, which is basically an underground lake.
Aquifers tend to be pretty large, so it is very common for hundreds of different wells in the same area to all be drawing from the same aquifer.
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