Kallanai, otherwise termed as "Grand Anaicut", was constructed by Karikalan Chola in 2nd Century. Here river Cauvery was subdivided as four other fours namely Kollidam, Kaviri, Vennaru and Puthu Aru which irrigates various farm lands around Tirchy and Thanjavur. The dam which was built using just sand and stone stands through centuries and it is one of the oldest dam in India. It is a favorite picnic spot for Tirchy people.
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