India’s longest canals do far more than move water. They decide which fields in Rajasthan turn green, how cargo once crawled along the Coromandel Coast, and why two neighboring states are still arguing in court. Agriculture remains the backbone of rural life here, so these channels sit very close to the country’s economy. This guide ranks India’s longest canals by length, shows where each one starts and ends, and explains what each one does. You will also find a comparison table and honest notes on figures that sources disagree about.
These canals play a crucial role in India’s agriculture, transportation, and water management, contributing significantly to the country’s economy and people’s livelihoods.
| Rank | Canal | Approx. Length | Starts At | States | Main Purpose |
|---|---|---|---|---|---|
| 1 | Indira Gandhi Canal | About 650 km | Harike Barrage, Punjab | Punjab, Haryana, Rajasthan | Irrigation, drinking water |
| 2 | Buckingham Canal | About 420 km in use (796 km originally) | Kakinada, Andhra Pradesh | Andhra Pradesh, Tamil Nadu | Navigation, transport |
| 3 | Upper Ganges Canal | About 437 km main (1,412 km with branches) | Haridwar, Uttarakhand | Uttarakhand, Uttar Pradesh | Irrigation |
| 4 | Sharda Canal | About 269 km main (up to 938 km with branches) | Banbasa and Sharda Barrage area, Uttarakhand and Uttar Pradesh | Uttar Pradesh | Irrigation |
| 5 | Sutlej Yamuna Link (SYL) Canal | 214 km (planned) | Near Kapoori, Punjab | Punjab, Haryana |
1. Indira Gandhi Canal
The Indira Gandhi Canal is India’s longest canal, and it is not close. The main channel runs roughly 650 km across the northwest, starting at the Harike Barrage in Punjab, where the Sutlej and Beas rivers meet. Water then flows west and south into Rajasthan’s Thar Desert.
Why it matters
Before this canal, large parts of Bikaner, Jaisalmer and Sri Ganganagar saw very little reliable water. Now farmers there grow wheat, cotton and mustard on land that used to be dunes and scrub. Rajasthan’s own officials describe it as a lifeline, and the description holds up.
Quick facts
- Former name: Rajasthan Canal. It was renamed after Indira Gandhi in 1984.
- Water source: The Sutlej and Beas, under allocations set by the Indus Waters Treaty.
- Main crops: Wheat, cotton, mustard.
- Catch: The canal reduces water scarcity, but waterlogging and salinity have crept into parts of the command area, so the story isn’t all good news.
2. Buckingham Canal
The Buckingham Canal is a different animal altogether. Nobody built it mainly for farms. British engineers designed it as a navigation channel, running parallel to the Bay of Bengal, so boats could carry salt, firewood, and grain between coastal towns without facing the open sea.
It is named after the Duke of Buckingham and Chandos, who was Governor of Madras at the time.
Route and length
Historically, the canal ran about 796 km from Kakinada in Andhra Pradesh to Villupuram in Tamil Nadu, passing near Chennai. Many modern lists quote roughly 420 km, likely reflecting the stretch that still holds water. Silting, encroachment, and the spread of railways and roads have sharply cut its commercial use.
Today
Parts of the canal in Chennai now act as drains and, sadly, as dumping spots. Restoration plans have come and gone over the years. Still, anyone interested in how coastal trade worked before trains should start with this canal.
3. Upper Ganges Canal
Opened in the 1850s, the Upper Ganges Canal ranks among the world’s oldest large irrigation works. It draws water from the Ganga at Haridwar and sends it across the Doab, the fertile land between the Ganga and Yamuna, toward Aligarh via Meerut and Bulandshahr.
Length and network
The main line is reported at about 437 km. Add every branch and distributary, and the network reaches around 1,412 km, making it a sprawling system rather than a neat ribbon.
Why people still talk about it
- It turned western Uttar Pradesh into a wheat-and-sugarcane belt.
- Its design, led by engineer Proby Cautley, influenced canal building elsewhere.
- Age is now its enemy. Seepage, silt, and patchy maintenance hurt water delivery at the tail ends.
Some articles claim the canal is “shrinking” because of poor construction. I could not confirm that claim in reliable sources, so treat it with caution. Maintenance problems are real, but “shrinking length” likely refers to lining and repair work.
4. Sharda Canal
The Sharda Canal takes water from the Sharda River, also called the Kali, which is a tributary of the Ghaghara. The headworks sit near the Uttarakhand-Uttar Pradesh border, and the main canal heads southeast through Lakhimpur Kheri, Bahraich, and Shravasti.
Network size
The main channel runs around 269 km. However, including all branches and distributaries, the network is widely quoted at up to 938 km. That is why Sharda sometimes appears near the top of “longest canal” lists and sometimes does not.
What it does
Think of it as the irrigation grid for eastern Uttar Pradesh. Reservoirs and distributaries spread water across wheat, rice, and sugarcane fields in districts that would otherwise depend on erratic monsoon rain.
5. Sutlej Yamuna Link (SYL) Canal
The SYL canal is the odd one out because it is still unfinished. The planned length is 214 km, and it is meant to carry water from the Sutlej basin toward the Yamuna in Haryana, crossing between two major river systems.
The dispute
Punjab and Haryana have fought over this canal for more than four decades. The 1981 water-sharing agreement set the plan in motion. Haryana built its portion, yet work in Punjab stalled, and the Supreme Court has repeatedly told the states to resolve it. Punjab argues that it has no spare water to give; Haryana argues that it has a legal right to its share.
Why it belongs on this list
It shows that a canal is also a political object. Length on paper does not equal water in the channel.
Other Notable Canals in India
Several shorter canals deserve a mention, mainly because they shaped regional farming or travel.
- Bhakra Canal: Fed by the Bhakra Dam, it supplies Punjab, Haryana and Rajasthan.
- Yamuna Canals: These run alongside the Yamuna and irrigate Haryana and western Uttar Pradesh.
- Kallanai (Grand Anicut): Strictly speaking, this ancient weir on the Kaveri in Tamil Nadu dates back roughly 2,000 years. It feeds the delta’s canal network and still works.
- West Coast Canal (National Waterway 3): About 205 km of Kerala’s inland waterway, including the Kottapuram to Kollam stretch, used for transport.
- Godavari delta canals: These support farming in Andhra Pradesh and Telangana.
- Alappuzha canals: Kerala’s backwater canals carry boats, fishing crews, and many tourists.
Some of the notable canals in India include:
- Bhakra Canal: Emerging from the Bhakra Dam, this canal system serves Punjab, Haryana, and Rajasthan and plays a crucial role in providing irrigation water.
- Yamuna Canal: This canal parallels the Yamuna River and delivers vital irrigation to the farmlands of Haryana and western Uttar Pradesh.
- Grand Anicut (Kallanai): Located in Tamil Nadu, this canal is one of India’s oldest man-made waterways, dating to the 2nd century AD. It channels water from the Kaveri River for irrigation.
- Kottapuram-Kollam Canal: Used for inland navigation and transportation, it is part of Kerala’s West Coast Canal system.
- Godavari Pushkaram Canals: These canal systems redirect water from the Godavari River, serving as a crucial source for irrigating agricultural lands in Andhra Pradesh and Telangana.
- Alappuzha Canals: Situated amid the picturesque backwaters of Kerala, these canals serve as vital transportation channels, thriving fishing hubs, and major tourist attractions in the scenic Alappuzha region.
