The Chandragiri River, also known as the Payaswini River in Karnataka and as the Perumpuzha River in Kerala,[1][2][3] is the longest river in Kasaragod district, Kerala, India.
The River Is A Historical Treasure Of Chemnad. It was named after the Mauryan emperor Chandragupta Maurya.[5][6][7]
The Chandragiri or Perumpuzha River is considered the traditional boundary between the Tulu Nadu and Malayalam regions of Kerala from the 14th century AD onwards; before that it was north of Kumbala.[8]
In 16th-century Portuguese geographies, the Chandragiri River is called the "Rio Cangerecora", and identified as the boundary between the "province of Canará" (Kannada-speaking coastal south Karnataka, vassal of "Bisnaga", Vijayanagara Empire) and the independent kingdoms of "Malabar" (Kerala).[9][10]