Kallanai Dam : The Ancient Wonder Still Shaping Modern Agriculture INTRODUCTION Kallanai dam, also known as Grand Anicut, is one of the oldest water-regulating structures in the world and the oldest dam in India that is still in use. It was built across the Kaveri River by the Chola king Karikala Chola around the 2nd century CE. ABOUT KALLANAI DAM: Length: Approximately 329 meters. Width:...