Walayar River is one of the tributaries of the river Kalpathipuzha.It originates in the Sirumalai hills. The Kalpathipuzha is one of the main tributaries of the Bharathapuzha River, the second-longest river in Kerala, India. The Walayar Dam is constructed across this river. It was completed and opened in 1964. The river is by a valley and a garden equipped with a children's play area. Previously, Walayar Dam was as famous as Malampuzha Dam.