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[[File:200px-TemplePondChennai.jpg|200px|thumb|right|A temple pond at Mylapore, Chennai, India]]

Around 4,000 temples in Tamilnadu state traditionally had water tanks that were used for various rituals. The tanks also served as natural aquifers and helped recharge groundwater. Over the years, however, many of these tanks have gone out of use. Overflowing mounds of silt and garbage have replaced the water in them.