Answer: Kallanai Dam
Kallanai, also known as the Grand Anicut Dam, is a historic dam.
- It is constructed across the Kaveri River, which flows from Tiruchirapalli District through Thanjavur District in Tamil Nadu, India.
- The dam is situated in the municipality district of Thanjavur.
- The dam, 15 kilometers from Tiruchirapalli and 45 kilometers from Tanjavur, was built around 150 years ago during Chola ruler Karikalan.
- It is the world’s fourth-oldest water redirection technique or water-regulator construction and the oldest still in service in India.
- It is a popular tourist destination in Tamil Nadu due to its stunning architecture.