The area of land through which water percolates to be stored as groundwater is known as an aquifer.

Here's a breakdown:

* Aquifer: A geological formation (like sand, gravel, or rock) that is permeable and allows groundwater to flow through it.

* Percolation: The process of water moving through the soil and rock layers downwards.

* Groundwater: Water that is stored underground in the spaces between soil particles and rock formations.

So, an aquifer acts like a giant underground reservoir, holding water that can be accessed through wells.