The upper limit of an unconfined underground reservoir of water is termed the:

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The term "water table" refers to the upper limit or boundary of an unconfined underground reservoir of water. This is the point at which the soil and rocks below the Earth's surface are completely saturated with water, and above this point, the ground is unsaturated. Aquifer refers to the underground layers of rock or sediment that hold groundwater, while watershed is a geographical area where all the water that falls within it will flow into a particular water source like a river, lake, or ocean. Wetland refers to a land area that is saturated with water, either permanently or seasonally, and is characterized by specific vegetation and soils. Groundwater refers to water located beneath the Earth's surface, regardless of whether it is confined or unconfined.

The Upper Limit of an Unconfined Underground Reservoir of Water