India-Bangladesh border

Topic: India and her Neighbours · NCERT: Class 7, Ch 2 "India and Her Neighbours"

Meaning

The India-Bangladesh border is the land boundary between India and Bangladesh. It is 4,096.7 km long and touches five Indian states: West Bengal, Tripura, Meghalaya, Mizoram and Assam [4]. It is India's longest land border, longer than the India-China border. Rivers cross it many times, and it holds thick crowds of people, so guarding it is hard. That makes it central to border security, migration and water-sharing questions.

Explanation

How the border came about and its shape

• Bangladesh was once East Pakistan. It became a free country in 1971, after a war between India and Pakistan.
• People on both sides speak Bangla (Bengali), as people in West Bengal do. So language and culture link the two sides.
• India surrounds Bangladesh on three sides: west, north and east.
• Only its south side opens onto the Bay of Bengal.

• A short south-eastern stretch touches Myanmar.

• Tripura is almost an island of India inside Bangladesh. Bangladesh lies to its north, west and south.

Length of the border, state by state

State	Border length	Rank
West Bengal	2,216.7 km	1
Tripura	856 km	2
Meghalaya	443 km	3
Mizoram	318 km	4
Assam	263 km	5

• West Bengal has more than half of the whole border. Assam has the shortest stretch [4].

Why the border is hard to guard (cause → process → result)

• Rivers shift their course.
• A river can move after a flood.

• So a border line drawn along it can end up on dry land or in the middle of the stream.

• Chars (sandy islands in a river) are made of silt (fine soil carried by water).

• They can wash away again within a few years.

• People farm and live on them, but they are hard to mark and patrol.

• Crowded plains: villages, farms and homes come right up to the border line. Some houses sit on the line itself.

• Result: fencing is slow, and in some places it cannot be built at all.

• So smuggling (cattle, drugs, fake currency) and illegal migration are ongoing problems.

• Fencing status (2025): 3,232.218 km is fenced. 864.482 km is still open. Of that open stretch, 174.514 km is "non-feasible": the land is river or marsh, so a fence cannot stand there [4].

• In West Bengal, 1,647.696 km of the 2,216.7 km is fenced. Of the 569.004 km gap, 112.780 km cannot be fenced at all [4].

Settling the border: enclaves and the Land Boundary Agreement (LBA)

• Enclave: a piece of one country that lies fully inside another country. People living there were cut off from their own government. They had no schools, no police and no proper ID papers.
• Adverse possession: land that legally belongs to one country but is held and farmed by people of the other country.
• Steps to the solution:
• 1974: India and Bangladesh signed the Indira-Mujib Land Boundary Agreement. It was never fully carried out.
• 2011: a Protocol (an add-on agreement) settled the details that were still open.
• 2015: Parliament passed the Constitution (100th Amendment) Act, 2015. An amendment was needed because giving away Indian land changes India's territory.

• 31 July 2015 (midnight): the enclaves were exchanged.

• What was exchanged [2][3]:

	Number	Area	Where
Indian enclaves inside Bangladesh	111	17,160.63 acres	Panchagarh, Lalmonirhat, Kurigram and Nilphamari districts
Bangladeshi enclaves inside India	51	7,110.02 acres	All in Cooch Behar, West Bengal

• India gave away more enclave land but gained in adverse possessions. It received 2,777.038 acres and transferred 2,267.682 acres [2][3].
• A joint headcount in July 2011 found about 51,549 people in the enclaves: 37,334 in Indian enclaves and 14,215 in Bangladeshi enclaves [2].
• Residents chose their citizenship. They could stay and take the citizenship of the country they lived in, or move across.
• About 6.1 km of undemarcated border (a stretch never marked on the ground) was fixed, in three sectors.
• Sea border: in 2014, the Bay of Bengal maritime boundary was settled by arbitration (a ruling by a neutral tribunal that both sides agree to accept).

Where it occurs

• Indian side: West Bengal, Tripura, Meghalaya, Mizoram and Assam [4].
• Enclave areas: Cooch Behar (West Bengal) and the Panchagarh, Lalmonirhat, Kurigram and Nilphamari districts of Bangladesh [2][3].
• Shared rivers: the two countries share 54 rivers. Seven of them are priority rivers for water-sharing frameworks [7]. A transboundary river is one that flows through, or along the border of, two or more countries. Bangladesh sits at the lower end of the Ganga-Brahmaputra-Meghna system, so most of its water comes from India.
• Ganga (Padma): enters Bangladesh below Farakka. The Farakka barrage (1975) is in Murshidabad, West Bengal.
  • It sends part of the Ganga's water into the Bhagirathi-Hooghly to flush silt away from Kolkata port.
  • As a result, less water reaches Bangladesh in the dry months.
  • The Ganga Waters Treaty (12 December 1996) runs for 30 years. Water is shared at Farakka during the lean season (1 January to 31 May), in 10-day periods [5]. It runs out in December 2026.
• Brahmaputra (Jamuna): enters Bangladesh near Dhubri (Assam). There is no water-sharing treaty.
• Teesta: flows from Sikkim through north West Bengal and joins the Jamuna. A deal was ready in 2011 but has not been signed, mainly because West Bengal objected.
• Barak: splits at the border into the Surma and Kushiyara. They meet again in Bangladesh to form the Meghna. Under the Kushiyara interim MoU (6 September 2022), each side may draw up to 153 cusecs in the dry season [6]. A cusec is one cubic foot of water flowing past a point each second.

• Feni: forms the border in south Tripura. Under a 2019 MoU, India may draw 1.82 cusecs for drinking water for Sabroom [7]. Maitri Setu (March 2021, 1.9 km) joins Sabroom (Tripura) with Ramgarh (Bangladesh) [8]. It gives Tripura a short road link to Chittagong port.

• Joint Rivers Commission (JRC): set up in 1972 to manage the shared rivers. Its 38th ministerial meeting was held in New Delhi on 25 August 2022 [7].

• Sundarbans: the world's largest mangrove forest, in the Ganga-Brahmaputra delta. It is shared by West Bengal and Bangladesh, with about 60% in Bangladesh [9].

Don't confuse with

• India-China border: a long Himalayan border, but shorter than the India-Bangladesh border. India-Bangladesh is India's longest land border.
• India-Bangladesh maritime boundary: the sea boundary in the Bay of Bengal, settled by arbitration in 2014. The enclave swap under the LBA (2015) settled the land border.
• Enclave vs adverse possession: an enclave is land of one country lying fully inside another country. Adverse possession is land that legally belongs to one country but is held and farmed by people of the other.
• Ganga Waters Treaty vs Kushiyara MoU: the Ganga treaty (1996) shares water at Farakka from 1 January to 31 May. The Kushiyara MoU (2022) is an interim deal allowing up to 153 cusecs from 1 November to 31 May [5][6].

Prelims Hooks

• India-Bangladesh border = 4,096.7 km. It is India's longest land border and longer than the India-China border [4].
• Order of states by border length: West Bengal > Tripura > Meghalaya > Mizoram > Assam. Trap: Assam, not Mizoram, has the shortest stretch [4].
• Constitution (100th Amendment) Act, 2015 brought the LBA into force. On 31 July 2015, India exchanged 111 Indian enclaves for 51 Bangladeshi enclaves, and all 51 were in Cooch Behar [2][3].
• River names in Bangladesh: Ganga = Padma; Brahmaputra = Jamuna; Surma + Kushiyara → Meghna.
• Farakka barrage is in Murshidabad, West Bengal. The Teesta water deal is still not signed.
• Maitri Setu crosses the Feni and links Sabroom (Tripura) with Ramgarh (Bangladesh) [8].

Mains Points

• Physical geography makes border management hard (GS-I/GS-III):
• Shifting rivers, chars and crowded plains leave 864.482 km unfenced. Of that, 174.514 km cannot be fenced at all [4].
• This feeds smuggling and illegal migration.

• Possible responses: "smart" fencing with sensors, river patrols by boat, and border haats (border markets) for legal trade.

• The LBA (2015) is a model for settling a border peacefully:

• Swapping 162 enclaves ended the stateless life of about 51,000 people [2].
• Fixing adverse possessions and the 6.1 km undemarcated stretch made the border easy to mark.

• The 2014 sea-boundary ruling opened the Bay of Bengal for fishing and for oil and gas exploration.

• Water sharing is the core resource issue (GS-I/GS-III):

• Bangladesh is the lowest country on the Ganga-Brahmaputra-Meghna system. So upstream works such as Farakka and Teesta canals hit its farms and fisheries.
• The unsigned Teesta deal and the renewal of the Ganga Treaty before December 2026 keep this issue central.
• Joint river-basin management through the JRC can help with floods, river navigation and silt. Joint protection of the shared Sundarbans is also needed.

Related concepts

• Land Boundary Agreement 2015
• Transboundary rivers

Read more

• Bangladesh: the longest border and shared rivers