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A cistern (from Middle English cisterne; from Latin cisterna, from cista 'box'; from Ancient Greek κίστη (kístē) 'basket'[1]) is a waterproof receptacle for holding liquids, usually water. Cisterns are often built to catch and store rainwater.[2] To prevent leakage, the interior of the cistern is often lined with hydraulic plaster.[3]
Cisterns are distinguished from wells by their waterproof linings. Modern cisterns range in capacity from a few litres to thousands of cubic meters, effectively forming covered reservoirs.[4]