A well through which underground water comes out by itself.
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Answer:
Most wells do not get their water from underground rivers, but instead get the water from aquifers. Aquifers are layers of rock and soil with water flowing through their small pores. For the most part, there are not giant caves under earth's surface containing violent rivers of water flowing quickly through them. Instead, groundwater drips slowly and gently through the small spaces within rocks, between rocks, and between loose materials such as sand and gravel. In fact, water in aquifers can take years to centuries to flow back to the surface, as shown in the figure. A typical flow rate for water in aquifers is ten feet per year. For this reason, if a region experiences no rain for a few weeks, the wells will not immediately run dry.