Vembanad (Vembanad Kayal or Vembanad Kol) is the longest lake in India, and the largest lake in the state of Kerala. It is also counted as one of the largest lakes in India. Spanning several districts in the state of Kerala, it is known as vembanadu Lake in Kottayam Punnamada Lake in Kuttanad, Kochi Lake in Kochi. Several groups of small islands including Vypin, Mulavukad, Vallarpadam, Willingdon Island are located in the Kochi Lake portion. Kochi Port is built around the Willingdon Island, and the Vallarpadam island.

The Nehru Trophy Boat Race is conducted in a portion of the lake. High levels of pollution have been noticed at certain hotspots of the Vembanad backwaters. Government of India has identified the Vembanad wetland under National Wetlands Conservation Programme.

Kollam (earlier known as Quilon) was one of the leading trade centres of the ancient world, eulogised by travellers such as Ibn Battuta and Marco Polo. It is also the starting point of the backwater waterways. The Ashtamudi Kayal, known as the gateway to the backwaters, covers about 30 per cent of Kollam. Sasthamcotta Kayal, the large fresh water lake is 28.5 km from Kollam city. Islands are the eye-catching factors as well as the beauty of Lake Ashtamudi, Kollam. Most of these islands are potential tourism spots in the state. The Indian Railways also planning to develop one of the islands in Kollam for a tourism project.[10] There are big as well as small islands which are inhabited and uninhabited by human beings. There are more than 15 islands in Ashtamudi Lake.

Kozhikode (also known as Calicut) has backwaters which are largely unexplored by tourist hordes. Elathur, the Canoly Canal and the Kallayi River are favourite haunts for boating and cruising. Korapuzha, the venue of the Korapuzha Jalotsavam, is a popular water sport destination.

The Chinese fishing nets at Fort Kochi, located in the Kochi city of Kerala, make up a very popular tourist attraction. They are fixed land installations, which are used for a very unique and unusual method of fishing. Operated from the shore, these nets are set up on bamboo and teak poles and held horizontally by huge mechanisms, which lower them into the sea. They look somewhat like hammocks and are counter-weighed by large stones tied to ropes. The entire structure of the Chinese fishing nets is about 10 meters in height. Each fishing net spreads to about 20 meters over the water body and is operated by a team of some six fishermen. Each net has a limited operating depth. Due to this, an individual net cannot be repeatedly operated in tidal waters. There are different fishing nets for operation, depending on the state of the tide. The whole paraphernalia is such that that the weight of a man walking along the main beam is sufficient to cause the net to descend into the sea.

The net is left into the water for a short time; say for four-five minutes, before it is raised back by tugging the ropes. The catch is usually modest, but these can be sold to the passersby in a jiffy. The Chinese Fishing Nets of Cochin are said to have their origin in China. This is not totally impossible, as China is located at a distance of 5,000 km from Kochi and the city has always been an important center for trade, attracting traders and seafarers from far and near.