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A reservoir is an artificial lake created by flooding land behind a
dam. Some of the world's largest lakes are reservoirs.
Surveyors have to find river valleys which are deep and narrow; the valley sides can then act as natural walls. The best place
for building a dam has to be determined. If necessary, humans have to be rehoused and/or historic sites have to be moved, e.g.
the temples of Abu Simbel before the construction of the Aswan Dam, creating Lake Nasser.
A reservoir may also be an accumulation of oil or gas beneath the Earth's surface.
Reservoir may also refer to a carrier of a virus or parasite for which they are not pathogenic.
See also: List of reservoirs and dams
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