Which one of the following is NOT a west flowing river ?

Which one of the following is NOT a west flowing river ?

Periyar
Bharatpuzha
Pamba
Tamraparni
This question was previously asked in
UPSC NDA-1 – 2019
Rivers in India are broadly classified based on where they drain their waters. West-flowing rivers flow into the Arabian Sea, while east-flowing rivers flow into the Bay of Bengal. Periyar, Bharatpuzha, and Pamba are all significant rivers flowing westward through the state of Kerala into the Arabian Sea. The Tamraparni River, however, flows eastward through Tamil Nadu and drains into the Gulf of Mannar (part of the Bay of Bengal).
– Periyar, Bharatpuzha, and Pamba are major west-flowing rivers of Kerala.
– Tamraparni is a major river of Tamil Nadu that flows eastward.
Most major rivers in the Deccan Plateau flow eastward into the Bay of Bengal because the general slope of the plateau is from west to east. Exceptions are a few large rivers like Narmada and Tapti, and many smaller rivers in the Western Ghats that flow westward.