What is another word for natural reservoir?
Pronunciation: [nˈat͡ʃəɹə͡l ɹˈɛzəvwˌɑː] (IPA) 
A natural reservoir is a body of water that collects and stores water from rainfall, snowmelt, and groundwater. Synonyms for this term include natural cistern, aquifer, and underground basin. Other synonyms include water table, underground water supply, and subterranean water source. A natural reservoir can also be called a natural tank or storage unit. These terms are all used to refer to a body of water that is naturally occurring, and that collects and stores water for use by plants, animals, and humans. A natural reservoir is an important source of fresh water and can also provide a habitat for a variety of species.
