This vast tank, 5km east of the old city, covers an area almost equal to that of Sri Meenakshi Temple and is the site of the popular Teppam (Float) Festival, held in January/February, when devotees boat out to the goddess temple in the middle. When it's empty (most of the year) it becomes a cricket ground for local kids. The tank was built by Tirumalai Nayak in 1646 and is connected to the Vaigai River by underground channels.