Kadalundi River (Kadalundipuzha) is one of the four major rivers flowing through Malappuram district in the Indian state of Kerala. The other three are the Chaliyar, the Bharathappuzha and the Tirur River. This rain-fed river is 130 kilometres (81 mi) long and is one of the most important rivers in the district. Kadalundi River is also the sixth longest River in Kerala. Kadalundi River passes through [Karuvarakundu, Tuvvur [Melattur, Kerala|Melattur]], Pandikkad, Manjeri, Malappuram, Panakkad, Parappur, Vengara, Tirurangadi, Parappanangadi, Vallikkunnu, and empties itself into Arabian sea at Kadalundi Nagaram in Vallikkunnu on the northwestern border of the district. It is formed by the confluence of the Olippuzha River and the Veliyar River. The Kadalundi originates from the Western Ghats at the western border of the Silent Valley and flows through the district of Malappuram. It has two main tributaries namely Olipuzha and Veliyar. Olipuzha and Veliyar merges together to become Kadalundi River near Melattur. Kadalundi River traverses through the historical regions of Eranad and Valluvanad. The Kadalundi River drains an area of 1274 km2 and has a length of 120 km. The ancient port of Tyndis, which was the second-largest trading port of Chera dynasty, only after to Muziris, is identified with the mouth of this river at Vallikunnu. The Kadalundi Bird Sanctuary spreads over a cluster of islands where the Kadalundipuzha River flows into the Arabian Sea. There are over a hundred species of native birds and around 60 species of migratory birds in large numbers annually.

Malappuram, is one of the 14 districts in the Indian state of Kerala, with a coastline of 70 km (43 mi). The most populous district of Kerala, Malappuram is home to around 13% of the total population of the state. The district was formed on 16 June 1969, spanning an area of about 3,554 km2 (1,372 sq mi). It is the third-largest district of Kerala by area. It is bounded by Western Ghats and the Arabian Sea on either side. The district is divided into seven Taluks: Eranad, Kondotty, Nilambur, Perinthalmanna, Ponnani, Tirur, and Tirurangadi.