It is a unique environment a 5 large lakes interconnected by a network of manmade canals. It has a unique ecosystem where the feshwater of the canals meets the sea water from the Arabian sea - in fact there is a dam built across the Venbanad Lake to prevent the 2 mixing. The people who live there use the canals to their advantage using a system of pumps to let in water to the rice fields - a main source of living for many. As is duck farming and shrimp and prawns are also a speciality. The area also attracts tourism with hundreds of kettuvallams being constructed as houseboats, luxuriously appointed for holidays on the backwaters. A style based on the old traditional kettuvallams. Many holiday resorts have been built around the lakes attracting visitors because of the variety of wildlife and in particular birds. Ayurvedic treatment is a speciality of the region. In August the traditional Snake Boat races are held - the Nehru Trophy Boat Race being the most famous. It's a beaut
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Most prestigious game the Snake Boat Race Festival also called Nehru Trophy Boat Race celebrated on second Saturday of August every year.
Being major tourist attraction this festival is celebrated near Alappuzha (Alleppey) in Lake Tranquil of Punnamada in Kerala. The Snake Boat Race festival is called Nehru Tropy Boat Race due to the Priminister of India, Pandit Jawahar Lal Nehru in 1952 visited Alappuzha, and awarded winners by the Silver Trophy.
Source: http://www.gillinternationaltravel.com/tours/kerala-snake-boat-ra ce.php