Kallanai (also known as the Grand Anicut) is an ancient dam, which is built (in running water) across the Kaveri river in Thogur - Koviladi village, Budalur Taluk in Thanjavur District in the state of Tamil Nadu in India. Located at a distance of 15 km from Tiruchirappalli, the dam was originally constructed by the Chola king Karikalan in c. 100 BC – c. 100 AD. It is located on Kaveri river approximately 20 KM from Trichy city, the dam comes under Thanjavur district. It is the fourth-oldest water-diversion or water-regulator structures in the world and the oldest in India which is still famous
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