Chandragiri River
The Chandragiri River also known as Perumpuzha River is the longest river in Kasaragod district, Kerala, India. It was named after the Mauryan emperor Chandragupta Maurya. The 17th century Chandragiri Fort is located on the river. Perumpuzha river is considered the traditional boundary between the Tulu Nadu and Malayalam regions of Kerala from the fourteenth century AD onwards; before that it was north of Kumbala. In Sullia taluk, it is the major water source for domestic and agricultural purposes. Course. The Chandragiri River originates from the northern slopes of the Greater Talacauvery National Park in the Western Ghats  at the Kodagu district, Karnataka. Initially the river flows through the Malenadu region of Karnataka passing the Pushpagiri Wildlife Sanctuary and flowing through several hilly towns in Kodagu and Dakshina Kannada like Adyadka, Biliyar, Parivarkana, Paladka, Sullia, Pilikodi and Kanyana. Chandragiri then enters Kerala and flows through several hilly towns in the eastern part of the Kasaragod district, namely Panjikkal, Kottyadi, Adhur, Poovadka, Kottamkuzhy, Bethurpuzha, Kundamkuzhy, Kolathur, Muliyar and Bovikanam. At Bovikanam it's major tributary, Kudumbur River merges with Perumpuzha. Then the river enters into the Malabar plains where it flows through Thekkil, Chengala, Chattanchal, Perumbala, Chemnad and Kasaragod . The Chandragiri River empties into the Arabian Sea at Thalangara in Kasaragod town. Tributaries. The River Chandragiri's largest tributary is the Kudumbur River, which joins the Payaswini on its left bank east of Chattanchal.