Vembanad Lake is situated in 9°35′N 76°25′E Coordinates and in 9°35′N 76°25′E. The primary inflow to this lake is through Manimala, Pamba, Meenachil, Periyar, Achenkovil and Muvattupuzha. The primary outflows are through several canals from this lake. The lake’s maximum length is 96.5 km and maximum width is 14 km. The surface area of the lake is 2033 km² and its maximum depth is 12 m. The surface elevation is only 0 m.
Vembanad Lake consists of Islands such as Pallippuram, Perumbalam and Pathiramanal. The settlements areas are Alleppy, Cochin, Cherthala. This Lake is locally known as Vembanad Kol or Vembanad Kayal.
It is to be noted that this Lake is the longest lake in India and in the state of Kerala. This lake spans across several districts in the state of Kerala. In different localities, this Lake is known by different names such as Kochi Lake in Kochi and Punnamada Lake in Kuttanad. It is to be noted that the Port of Kochi is perfectly located round Vallarpadam and Willingdon Island.
During the Onam celebration, the Nehru Trophy Boat Race is conducted in the Punnamada Lake in the Kuttanad region. In the Vembanad backwaters, there are High levels of pollution in certain hotspots. During the season of Nehru Trophy Boat Race, large number of local, domestic and foreign tourist through this place to witness the stiff competition among the snake boats. They enjoy the sight of boatmen in action, cheering spectators and hear with pleasant feel the chanting of folk song by the participants.