Vembanad is the longest lake in India, as well as the largest lake in the state of Kerala. With an area of 2033 square kilometers and a maximum length of 96.5 km, it is the second largest Ramsar site in India only after the Sunderbans in West Bengal. 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, Willingdon Island are located in the Kochi Lake portion. Kochi Port is built around the Willingdon Island and the Vallarpadam island.