Mullayar River is a tributary of the Periyar River, the longest river in Kerala.
It originates at Kottamalai peak [1] in the Periyar Tiger Reserve.
The Mullayar flows west through the reserve [2] and joins the Periyar at Mullakudy [1] just at the beginning of the Periyar lake formed by the Mullaperiyar dam.
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