Nandalar (நண்டலாறு) is a branch river of Cauvery River and flowing between Tiruvarur district and Mayiladuthurai district of the Indian state of Tamil Nadu.

It act as a border line for Thiruvarur and Mayiladuthurai Districts.

[citation needed] Nandalar is a branch of River Cauvery.Nandalar river split from Cauvery near Kumbakonam and it flown through Kumbakonam, Komal, Avazhikkarai, Nallaathur.

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