India-Bangladesh Border Disputes: History and Challenges

The line that separates India from Bangladesh runs for 4,096 kilometres, making it the longest border India shares with any neighbour. It cuts through paddy fields, slices across rivers, and in some places runs straight through the middle of villages. This boundary was drawn in a matter of weeks during the chaos of 1947, by a man who had never set foot in the region before. Decades later, the consequences of that hurried decision still shape lives, security policy, and diplomacy across the eastern frontier.

A line drawn in haste
Why the terrain made things worse
The puzzle of the enclaves
Living in statelessness
The 1974 agreement and the long wait
The challenge of fencing the border
Rivers that refuse to stay still
People who live on the line
Migration and security pressures
The unresolved question of water
The Farakka barrage and the 1996 treaty
Renewal and the Teesta deadlock
A border that still divides

A line drawn in haste

The boundary between India and Bangladesh is officially known as the Radcliffe Line, named after Sir Cyril Radcliffe, the British lawyer who drew it. Radcliffe arrived in India for the first time in July 1947 and was given just over five weeks to divide 450,000 square kilometres of territory inhabited by 88 million people. He had never visited the subcontinent and relied on outdated census figures and imprecise maps.

The task was to separate the British province of Bengal into a Hindu-majority western half, which became West Bengal in India, and a Muslim-majority eastern half, which became East Pakistan. East Pakistan later became Bangladesh after the 1971 Liberation War. The boundary was published on 17 August 1947, two days after independence.

The problem was that Bengal could not be cleanly split. Communities connected by language, kinship, and trade for generations suddenly found themselves on opposite sides of an international border. The Radcliffe Award divided settlements and farmland with little regard for how people actually lived. This is why the boundary is sometimes called a “bloody line” – the partition triggered mass migration and communal violence across the subcontinent.

Why the terrain made things worse

Unlike a border drawn along mountains or a major river, the India-Bangladesh boundary runs through flat, densely settled land. The frontier touches five Indian states – West Bengal, Assam, Meghalaya, Tripura, and Mizoram – and passes through plains, hills, jungles, and rivers. Cultivation often extends right up to the boundary line, and in many places villages sit directly on the “zero line” of the international border.

The puzzle of the enclaves

Perhaps the strangest feature of this border was the existence of enclaves, locally called chitmahals. An enclave is a fragment of one country’s territory completely surrounded by another country’s land. Some enclaves even contained counter-enclaves – a pocket of Indian land inside a piece of Bangladeshi territory, which was itself inside India.

These oddities were not created by Radcliffe. They date back centuries to land arrangements made between the Raja of Cooch Behar and the Maharaja of Rangpur. When the Radcliffe Line was drawn, these scattered patches were simply left where they were, trapping their residents in a legal limbo.

Living in statelessness

People living in the enclaves were effectively stateless. They could not easily access schools, hospitals, electricity, or police protection, because reaching their own country’s services meant crossing foreign soil. An estimated 51,500 people lived in this condition for decades, without proper identity documents.

The 1974 agreement and the long wait

The two countries tried to fix this. The Land Boundary Agreement was signed in 1974 by Indira Gandhi and Sheikh Mujibur Rahman, which laid out a plan to exchange the enclaves. But India did not ratify it for years, partly because the demarcation was incomplete and partly because of domestic political resistance. The agreement sat unimplemented for over four decades.

The breakthrough finally came in 2015. India passed the 100th Constitutional Amendment to ratify the deal, and on 1 August 2015 the two countries officially exchanged 162 enclaves. India transferred 111 enclaves to Bangladesh and received 51 in return. Residents were allowed to choose which country’s citizenship they wanted. This resolved a 300-year-old anomaly that the partition had frozen in place.

The challenge of fencing the border

One of India’s main responses to border problems has been to build a fence. The idea of fencing the eastern frontier traces back to the Assam Accord of 1985, which sought to curb irregular migration, and serious construction began in the 1990s. The goal was to control illegal crossings, smuggling, and other cross-border crime.

But fencing a 4,096 km border through such difficult terrain has proven enormously hard. India has fenced roughly 3,000 kilometres, but several hundred kilometres remain open. According to one assessment, about 850 km is still unfenced, of which around 175 km runs through rivers and marshes where building a barrier is simply impossible.

Rivers that refuse to stay still

A major obstacle is the riverine nature of the border. Over 900 kilometres of the boundary follows rivers, and these waterways frequently change course due to erosion and silt deposits. When a river shifts, the land along it – including newly formed sandbanks called chars – becomes contested. A fixed fence cannot follow a moving river. To patrol these stretches, the Border Security Force relies on its water wing rather than physical barriers.

People who live on the line

The other obstacle is human. In many areas, homes and farms sit so close to the boundary that there is no room for a fence without disrupting daily life. Acquiring land for fencing has been slow and politically sensitive, with residents and even state governments raising objections. Bangladesh has also protested fencing efforts, pointing to a 1975 agreement that prohibits building defence structures within 150 yards of the zero line. India argues that its single-row fence does not count as a defence structure, but the disagreement has occasionally led to tense standoffs between the BSF and Border Guards Bangladesh.

Migration and security pressures

Because the border is so porous, it has become a focal point for concerns about illegal migration. Bangladesh is one of the most densely populated countries in the world, and economic and environmental pressures have historically pushed people across the boundary in search of work and land. This has made undocumented migration a politically charged issue, especially in states like Assam and West Bengal.

The scale of activity along the border is significant. The BSF’s Eastern Command reported apprehending over 10,000 Bangladeshi nationals in a single year while they were trying to cross illegally, along with large seizures of narcotics, contraband, and smuggled gold. Cattle smuggling has long been another persistent problem along the agrarian stretches.

The difficulty of sealing the border has pushed authorities toward unusual solutions. In 2026, the BSF floated a controversial proposal to deploy reptiles such as snakes and crocodiles in riverine gaps as natural deterrents where fencing is not feasible. The idea drew immediate criticism from human rights activists and wildlife conservationists, but it highlights just how stubborn the security challenge remains.

The unresolved question of water

Land is not the only thing the two countries argue over. They share 54 trans-boundary rivers, and water-sharing has been a recurring source of friction. The most important of these disputes centres on the Ganga (Ganges).

The Farakka barrage and the 1996 treaty

The trouble began when India built the Farakka barrage, which became operational in 1975, to divert water into the Hooghly River and keep the Kolkata port navigable by flushing out silt. Bangladesh, located downstream, complained that the barrage reduced the flow reaching its territory, harming agriculture, fisheries, and navigation, and allowing salinity to creep into the Sundarbans.

After years of disagreement, the two sides signed the Ganges Water Treaty on 12 December 1996, a 30-year arrangement that set out how the Ganga’s waters at Farakka would be shared during the dry season. The treaty recognised Bangladesh’s rights as a lower riparian state and established a formula for dividing the available flow.

Renewal and the Teesta deadlock

That treaty is now due for renewal in 2026, and negotiations bring fresh complications. Bangladesh wants future calculations to account for upstream water withdrawals across the entire Ganga basin, while India argues that present-day flow realities at Farakka cannot be ignored. Adding another layer of difficulty, water-sharing is not purely a national matter – West Bengal’s state government has objected to deals being made without its involvement, which has stalled progress on the long-pending Teesta River water-sharing agreement for years.

A border that still divides

The India-Bangladesh boundary shows how a decision made in a few weeks can echo for generations. The Radcliffe Line did not just separate two countries; it divided communities, split farmland, and created enclaves that left tens of thousands stateless. The 2015 enclave exchange resolved one of the oldest of these problems, but security concerns over migration and smuggling, the practical impossibility of fencing rivers, and unsettled water-sharing arrangements mean the border remains an active source of negotiation. Managing this frontier requires balancing hard security needs against the human reality of people whose lives straddle a line they never chose.

What do you think? Should border policy along such a densely populated frontier prioritise security infrastructure like fencing, or is cooperative management with Bangladesh – on migration, water, and shared livelihoods – the more realistic long-term solution? And how much weight should the lived realities of border communities carry when national security decisions are made?

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Table of Contents

A line drawn in haste 🔗

Why the terrain made things worse 🔗

The puzzle of the enclaves 🔗

Living in statelessness 🔗

The 1974 agreement and the long wait 🔗

The challenge of fencing the border 🔗

Rivers that refuse to stay still 🔗

People who live on the line 🔗

Migration and security pressures 🔗

The unresolved question of water 🔗

The Farakka barrage and the 1996 treaty 🔗

Renewal and the Teesta deadlock 🔗

A border that still divides 🔗