Vembanad Lake

History

Vembanad is a coastal lagoon — one of a chain of such backwaters strung along the Kerala shore where rivers, sea and shifting sandbars have woven land and water into a single amphibious country. For centuries it was a highway before it was a holiday: rice, coir, spices and timber moved along it in country boats, and the ports at its northern end grew rich on the trade that passed through its mouth to the Arabian Sea.

The lake’s modern shape was written by human hands as much as by rivers. From the early nineteenth century, farmers in the region now called Kuttanad began the audacious work of reclaiming land from the shallow lake itself — throwing up bunds around patches of water, pumping them dry and planting rice on the lakebed. These reclaimed fields, the kayalnilams, sit below sea level, making Kuttanad one of the very few places on earth where paddy is farmed several feet beneath the tideline, kept dry only by an unending cycle of bunds and pumps.

The single greatest intervention was the Thanneermukkom barrage, built across the lake to stop salt water from the sea creeping up and ruining the paddy, linking Thanneermukkom in Alappuzha with Vechoor in Kottayam. 🛑 It is very widely called “the largest mud regulator in India”; it is neither — it is a reinforced-concrete barrage designed for 90 shutters and 4 navigation locks, and no national inventory supports “largest”. It also was not built in one campaign: the Kerala Irrigation Department records the Vechoor half completed in 1965 and the Thanneermukkom half in 1975, with the 428-metre middle standing as an earthen cofferdam until the central stage opened to traffic on 31 July 2018. Its shutters split Vembanad in two: a freshwater southern half held back for the farmers, and a tidal, brackish northern half open to the sea.

The barrage let Kuttanad’s farmers raise two or three crops a year where once they managed one, but it came at a steep ecological price. With the tidal flushing choked off, the southern lake stagnates for months, weeds such as water hyacinth choke the surface, and the famed inland fishery has collapsed — the catch of Karimeen, the pearl spot that is Kerala’s state fish, falling dramatically in the decades since the shutters closed. Silting and encroachment have shrunk and shallowed the lake, and its long-term health is now a live public debate.

In recognition of its outsized importance to wildlife and to people, Vembanad — together with the Kol wetlands to its north — was designated a Wetland of International Importance under the Ramsar Convention in 2002, ranking among the largest such sites in the country. It remains a vast, stressed, still astonishing ecosystem, and Kumarakom is the window through which most travellers come to know it.

Why visit

This is the backwaters at their most iconic — the very landscape that made Kerala famous. A cruise from Kumarakom across Vembanad delivers the postcard in motion: houseboats on open water, coconut palms leaning to their own reflections, and villages living at the waterline.

It is the largest lake in Kerala and widely counted the longest in India, a genuinely vast expanse that gives the horizon a sea-like openness rare among lakes — the sense of scale alone is worth the trip.

The Kumarakom Bird Sanctuary on the shore turns the lake into one of South India’s finest birding grounds, alive with egrets, herons, darters and cormorants year round and with Siberian and Himalayan migrants from November to February.

The choice of boats suits every appetite: a slow overnight kettuvallam houseboat for romance, a nimble shikara or canoe for the hidden canals of Kuttanad, or a short sunset cruise for those with only an evening to spare.

Kumarakom itself is a calm, green, well-served base — a cluster of islands and quiet resorts on the lake’s edge — that lets you experience the vastness of Vembanad without the bustle of a town, making it a favoured spot for honeymooners and unhurried travellers.

In August the lake near Alappuzha explodes into the Nehru Trophy snake-boat race and the wider Vallam Kali season, one of India’s great spectacles of colour, chant and sinew — a very different, thunderous face of the same tranquil water.