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"This 16 km-long reservoir in northeast Tamil Nadu is both a crucial water source for Chennai and a living example of Chola-era hydraulic engineering: built by Prince Rajaditya Chola (originally named Veernanarayana Mangalam), it still relies on 72 sluice valves to capture Kollidam River floodwaters and irrigate extensive paddy fields. Beyond its utilitarian role, the lake is culturally resonant—featured at the opening of the Ponniyin Selvan novel and linked to colourful Aadi Perukku riverbank festivals that continue to draw locals for seasonal thanksgiving-style celebrations." - Meenakshi J
Ancient man-made lake, vital water source for Chennai
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