Kallanai Dam
The 928th tallest dam in the world
Kallanai (literally “stone dam”, also known as the Grand Anicut) is an ancient dam built by Karikala of Chola dynasty in 150 CE. It was built (in running water) across the Kaveri river flowing from Tiruchirapalli District to Thanjavur district, Tamil Nadu, India. The dam is located in Thanjavur district, 15 km from Tiruchirapalli and 45 km from Thanjavur. It is the fourth oldest water-diversion or water-regulator structure in the world and the oldest in India that is still in use.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).