Vembanad is the longest lake in India, as well as the largest in the state of Kerala. The lake has an area of 230 square kilometers and a maximum length of 96.5 km. Spanning several districts in the state of Kerala, it is known as Vembanadu Lake in Kottayam, Vaikom, Changanassery, Punnamada Lake in Alappuzha, Punnappra, Kuttanadu and Kochi Lake in Kochi. Several groups of small islands including Vypin, Mulavukad, Maradu, Udayamperoor, Vallarpadam, and Willingdon Island are located in the Kochi Lake portion. Kochi Port is built around the Willingdon Island and the Vallarpadam island.

Kottayam is a city in the Indian state of Kerala, flanked by the Western Ghats on the east and the Vembanad Lake and paddy fields of Kuttanad on the west. It is the district headquarters of Kottayam district, located in south-west Kerala. Kottayam is located in the basin of the Meenachil River at an average elevation of 3 metres (9.8 ft) above sea level. It has a moderate climate. It is located approximately 155 kilometres (96 mi) north of the state capital Thiruvananthapuram.