The surface that separates the saturated zone (where all void spaces are filled with groundwater) from the unsaturated zone (where void spaces hold both water and air) is called the: water table.
The zone of saturation's top surface is known as the water table. The zone of saturation is the area where water has accumulated in the ground's pores and fissures. It may also be stated simply as the level of saturation of the ground.
The water table is the top layer of subsurface water. All the pores and fissures in sediments and rocks are entirely filled (saturated) with water under this level. Ground water is found in these saturated zone, sometimes referred to as the saturated zone (or phreatic zone).
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