Identify the false statement regarding the Periyar River's characteristics and historical references.
        
    - The Periyar River is recognized as the river with the most tributaries in Kerala.
- According to a 2019 report by the Centre for Water Resources Development and Management, the Periyar is the most polluted river in Kerala.
- The Kallayi River, flowing through Kozhikode city, is identified as the most polluted river in Kerala in the latest report by the Central Pollution Control Board.
- The river is known by names such as Aluvapuzha and Kaladipuzha.