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This river had the name of Porunai in ancient Tamil country. The name of Thamirabarani is assumed from the high content of Copper in this river. This copper content also makes the water of this river, sweet or tasty.
The Thamirabarani river runs through the districts of Tirunelveli and Thoothukudi. The length of this river is 128 kilometres (80 mi). This river and its tributaries brings water to these districts. Therefore, the water is used for irrigation purposes.