Korapuzha also known as Elathur River is a short river of 40 km (25 mi), with a drainage area of 624 km2 (241 sq mi), flowing through the Kozhikode district of Kerala state in India. It is formed by the confluence of two streams, Agalapuzha and Punnoorpuzha which originate in the mountains of Wayanad district. The Korapuzha empties into the Arabian Sea at Elathur. The river and its main tributaries become tidal as they near the Arabian Sea. There is heavy boat traffic over the last 25 km (16 mi) of its course. It forms part of the West Coast Inland Navigation System.
The Korapuzha is generally considered as the cordon sanitaire between the North Malabar and South Malabar in the erstwhile Malabar District. Until the 20th century the Nair women of North Malabar crossing the Korapuzha and going south or marrying a person from South Malabar was considered a taboo and those who violated faced Bhrasht (Ostracism) and forfeiture of caste.