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| Length (km) | Name of river | Tributaries | Direction |
|---|---|---|---|
| 244 | Periyar | Edamala, Cheruthoni, Mullayar, Muthirapuzha, Perinjankutti | |
| 209 | Bharatapuzha | Thuthapuzha, Gayathripuzha, Kalpathipuzha, Kannadipuzha | |
| 176 | Pamba | Azhuthayar, Kakkiyar, Kakkattar, Kallar, Perunthenaruvi, Madatharuvi, Thanungattilthodu, Kozhithodu, Varattar, Kuttemperoor | |
| 169 | Chaliyar | Cherupuzha (Mavoor), Iruvanjippuzha, Cherupuzha (Areekode), Kuthirappuzha, Kuruvanpuzha, Kanjirappuzha, Karimpuzha, Pandippuzha, Neerppuzha | |
| 169 | Chalakudy | Parambikulam | |
| 130 | Kadalundy | ||
| 128 | Achankoil | ||
| 121 | Kallada | ||
| 121 | Muvattupuzha | ||
| 110 | Valapattanam | ||
| 105 | Chandragiri | ||
| 90 | Manimala | ||