Q. The Kallanai Dam is built across which river in Tamil Nadu?
Answer:
Kaveri
Notes: The Kallanai dam is an ancient dam, which is built across the Kaveri river in Tiruchirapalli district in Tamil Nadu. It is the 4th-oldest water-diversion or water-regulator structures in the world and the oldest in India which is still in use. Originally, the dam was constructed by the Chola king Karikalan in 2nd century AD.