Which one of the following Indian States does not have a common international border with Bangladesh ?

1. India's Land Frontiers: An Overview (basic)

To understand India's position in the world, we must first look at its massive physical footprint. India lies entirely in the Northern Hemisphere, stretching from the icy heights of the Himalayas to the tropical waters of the Indian Ocean. Its mainland extends between latitudes 8° 4' N and 37° 6' N, and longitudes 68° 7' E to 97° 25' E. A key point for your maps is that India is taller than it is wide: it measures about 3,214 km from north to south, compared to about 2,933 km from east to west Majid Husain, Geography of India, Chapter 16, p.28. India possesses a massive land frontier of approximately 15,200 km. This perimeter is shared with seven distinct neighbors. In the northwest, we share borders with Pakistan and Afghanistan. To the north lie China, Nepal, and Bhutan. Moving to the east, we meet Myanmar and Bangladesh. It is a common misconception among students that India’s longest border is with China or Pakistan because of their size or geopolitical prominence; however, India actually shares its longest international border with Bangladesh, stretching 4,096.7 km Majid Husain, Geography of India, Chapter 16, p.28. The nature of these borders varies significantly. The border with China (approx. 3,917 km) is largely defined by rugged, high-altitude terrain, including the famous McMahon Line in the Eastern Sector, which follows the Himalayan crest Majid Husain, Geography of India, Chapter 16, p.34. Conversely, the borders with Pakistan and Bangladesh are largely "political" boundaries, established during the partition of the subcontinent. While the land frontier is 15,200 km, India also boasts a significant total coastline of 7,517 km when including the mainland and the island territories of Lakshadweep and the Andaman and Nicobar Islands Majid Husain, Geography of India, Chapter 16, p.28.

Sources: Geography of India, Chapter 16: India–Political Aspects, p.28; Geography of India, Chapter 16: India–Political Aspects, p.34

2. The Political Geography of Northeast India (basic)

Northeast India, often referred to as the 'Land of the Seven Sisters', is a unique and strategically vital region connected to the rest of India via a narrow strip of land known as the Siliguri Corridor (popularly called the 'Chicken's Neck'). This region consists of seven contiguous states: Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, and Tripura. While Sikkim is geographically part of the Northeast and a member of the North Eastern Council, it is historically considered the 'brother' to the Seven Sisters rather than one of them Geography of India, Majid Husain, p.55. This region is a melting pot of diverse tribal ethnicities, which has historically led to complex movements for self-governance and autonomy Geography of India, Majid Husain, p.51.

From a political and administrative perspective, each state maintains its own capital and identity. For instance, the headquarters of the North-Eastern Frontier Railway is located in Maligaon (Guwahati), Assam, reflecting the region's logistical importance Geography of India, Majid Husain, p.15. Below is a quick reference for the capitals of these states:

State	Capital
Arunachal Pradesh	Itanagar
Assam	Dispur
Manipur	Imphal
Meghalaya	Shillong
Mizoram	Aizawl
Nagaland	Kohima
Tripura	Agartala

Introduction to the Constitution of India, D. D. Basu, p.506

Geopolitically, the region is defined by its massive international boundaries. India shares its longest international border (approx. 4,096 km) with Bangladesh, which touches five states: West Bengal, Assam, Meghalaya, Tripura, and Mizoram. In contrast, states like Nagaland and Manipur are oriented toward the east, sharing their international boundaries with Myanmar. This distinction is crucial for understanding regional security and trade, as the 'Act East Policy' relies heavily on these eastern gateways. Internal territorial disputes, such as those between Manipur and Nagaland, also shape the local political landscape Geography of India, Majid Husain, p.55.

Sources: Geography of India, India–Political Aspects, p.55; Introduction to the Constitution of India, TABLES, p.506; Geography of India, Transport, Communications and Trade, p.15

3. The Siliguri Corridor and Strategic Connectivity (intermediate)

The Siliguri Corridor, popularly known as the "Chicken's Neck," is a narrow stretch of land located in the state of West Bengal that serves as the vital land bridge connecting Mainland India with its eight North-Eastern states. Geographically, it is a narrow strip roughly 20 to 22 kilometers wide at its tightest point. This bottleneck is bounded by Nepal to the north, Bangladesh to the south, and lies in close proximity to Bhutan and the Chumbi Valley (a strategic tri-junction involving Tibet/China). This unique geography makes it one of the most sensitive and strategically significant regions in the world. From a security and defense perspective, the corridor represents a strategic vulnerability. Because it is the only terrestrial artery for the movement of troops, supplies, and civilian goods to the North-East, any hostile disruption here could effectively isolate the entire region from the rest of the country. To mitigate this risk, India has prioritized massive infrastructure projects. A primary example is the East-West Corridor, part of the National Highway development project, which aims to connect Silchar in Assam all the way to Porbandar in Gujarat Geography of India, Transport, Communications and Trade, p.4. This ensures that the North-East is integrated into the national economic fabric. Beyond military strategy, the Siliguri Corridor is a hub for trade and energy, housing critical rail lines and petroleum pipelines. However, the terrain is ecologically sensitive. The region is part of the Eastern Himalayan Biodiversity Hotspot, characterized by a wide diversity of ecosystems including mixed wet evergreen and deciduous forests Environment and Ecology, BIODIVERSITY, p.8. Because of the geographic constraints of the corridor, India has increasingly focused on transnational connectivity, seeking transit and transshipment rights through Bangladesh to provide alternative routes to the North-East, thereby reducing the exclusive reliance on this thin "neck" of land.

Sources: Geography of India, Transport, Communications and Trade, p.4; Environment and Ecology, BIODIVERSITY, p.8

4. Border Management and Guarding Forces (intermediate)

To understand India's territorial integrity, we must look at how we manage our vast and varied frontiers. India follows a 'One Border, One Force' policy to ensure specialized guarding. The Border Security Force (BSF) is tasked with the 4,096.7 km border with Bangladesh—the longest land boundary India shares with any neighbor Geography of India, India–Political Aspects, p.28. This border is uniquely challenging because it isn't just land; it involves shifting riverine channels, such as the Ganga between Murshidabad (India) and Rajshahi (Bangladesh), where the boundary physically moves as the river fluctuates Geography of India, India–Political Aspects, p.42. While most of the Indo-Bangladesh border has been peaceful since 1971, historical flashpoints like the Peerdivah/Beerdivah village incident in 2001 remind us of the complexities of undemarcated territories and enclaves Geography of India, India–Political Aspects, p.43, 62. Further east, the 1,643 km border with Myanmar presents different security dynamics. Unlike the fenced Bangladesh border, this region faces issues of insurgency and drug trafficking, involving groups like the Nagas and Mizos who have historically used the porous terrain for movement Geography of India, India–Political Aspects, p.50. To master the political geography of the Northeast, you must distinguish which states touch which international neighbor:

Neighbor	Bordering Indian States	Key Challenges
Bangladesh	West Bengal, Assam, Meghalaya, Tripura, Mizoram	Infiltration, cattle smuggling, riverine shifts.
Myanmar	Arunachal Pradesh, Nagaland, Manipur, Mizoram	Insurgency, drug smuggling, Diphu Pass tri-junction.

A crucial point for your maps: Manipur shares a border with Myanmar to its east but is separated from Bangladesh by the states of Mizoram and Assam. Understanding these overlaps is vital for internal security and diplomatic studies Geography of India, India–Political Aspects, p.49.

Sources: Geography of India, India–Political Aspects, p.28, 42, 43, 49, 50, 62

5. India-Myanmar Border: The Eastern Frontier (intermediate)

The India-Myanmar border, stretching approximately 1,458 km (though some modern surveys estimate it closer to 1,643 km), represents India's gateway to Southeast Asia. Unlike the flat, riverine plains of the border with Bangladesh, this frontier is defined by rugged, north-south mountain ranges known as the Purvanchal Hills. These hills serve as offshoots of the Himalayas and create a natural barrier between the two nations Geography of India, Physiography, p.1. Geographically, the boundary is quite unique as it largely follows the watershed divide between the Brahmaputra river system in India and the Ayeyarwady (Irrawaddy) river system in Myanmar Geography of India, India–Political Aspects, p.48.

Four Indian states share this international boundary, running from the north to the south: Arunachal Pradesh, Nagaland, Manipur, and Mizoram Geography of India, India–Political Aspects, p.49. A critical point of geographical interest is the Diphu Pass. This area serves as the tri-junction between India, China, and Myanmar. However, it has been a point of minor contention, as India maintains that the actual tri-junction lies slightly north of where other interpretations place it Geography of India, India–Political Aspects, p.49.

Despite being relatively peaceful compared to the western borders, this region faces significant security and social challenges. The thick, tropical forests make the terrain difficult to monitor, leading to two primary issues:

• Insurgency: Various rebel groups, such as the Nagas and Mizos, have historically used the porous border and the difficult terrain on the Myanmar side for sanctuary Geography of India, India–Political Aspects, p.50.
• Smuggling: The border is a known route for the illegal trafficking of drugs and narcotics, often linked to the proximity of the "Golden Triangle" in Southeast Asia Geography of India, India–Political Aspects, p.50.

Sources: Geography of India, Physiography, p.1; Geography of India, India–Political Aspects, p.48; Geography of India, India–Political Aspects, p.49; Geography of India, India–Political Aspects, p.50

6. In-depth: The India-Bangladesh Border (exam-level)

The India-Bangladesh border is not just a geographic line; it is a historical legacy of the 1947 Partition. Stretching across 4,096.7 km, it is the longest land border India shares with any neighbor Geography of India, India–Political Aspects, p.28. This boundary is shared by five Indian states, with West Bengal holding the lion's share (over 2,200 km). One of the most unique aspects of this border was the presence of enclaves (chhitmahals)—territorial 'islands' of one country located deep inside the other. For decades, residents in these areas lived in a state of statelessness, lacking basic government services because neither nation could easily access them. Historically, the border was defined by the Radcliffe Award (1947), but ambiguities led to frequent disputes. For instance, the shifting channels of the Ganga between Murshidabad (India) and Rajshahi (Bangladesh) created floating boundaries that were hard to police Geography of India, India–Political Aspects, p.42. To resolve these issues, several attempts were made, including the Nehru-Noon Agreement of 1958 and the Land Boundary Agreement (LBA) of 1974. However, a final resolution was only achieved recently through the 100th Constitutional Amendment Act (2015) Indian Polity, Union and Its Territory, p.51. Under the 2015 deal, India transferred 111 enclaves to Bangladesh, while Bangladesh transferred 51 enclaves to India. This required amending the First Schedule of the Constitution to modify the territories of four specific states: Assam, West Bengal, Meghalaya, and Tripura Indian Polity, Union and Its Territory, p.51. This act not only demarcated a 6.1 km undemarcated stretch but also addressed the human rights of thousands of residents who were finally allowed to choose their citizenship.

State	Approx. Border Length	Key Characteristic
West Bengal	2,216.7 km	Longest segment; riverine and fertile plains.
Tripura	856 km	Bordered by Bangladesh on three sides.
Meghalaya	443 km	Hilly terrain; significant for cross-border trade.
Assam	263 km	Divided into two segments by Meghalaya.
Mizoram	318 km	Southernmost tip of the border.

Sources: Geography of India, India–Political Aspects, p.28, 42; Indian Polity, Union and Its Territory, p.51; Introduction to the Constitution of India, TERRITORY OF THE UNION, p.76

7. Solving the Original PYQ (exam-level)

Having mastered the spatial geography of the North-Eastern states and India’s international boundaries, this question serves as the perfect application of your mental mapping skills. The building blocks you've learned—specifically the 'chicken’s neck' corridor and the distribution of the Seven Sister States—are essential here. To solve this, you must recall that India shares its longest land border (4,096.7 km) with Bangladesh, a boundary that wraps around five specific states. By visualizing the map from West to East, you can identify that West Bengal, Assam (Asom), Meghalaya, Tripura, and Mizoram form this continuous chain.

To arrive at the correct answer, reason through the geographical placement of the options provided. While West Bengal and Tripura are clearly deeply integrated with the Bangladesh border, the common trap lies in the internal arrangement of the North-East. Manipur is situated further east, landlocked between Nagaland to the north, Mizoram to the south, and Assam to the west. Crucially, its international boundary is exclusively with Myanmar, not Bangladesh. Therefore, (A) Manipur is the only state in the list that does not touch the Bangladeshi border, as it is geographically shielded by the 'buffer' of Assam and Mizoram.

UPSC frequently uses distractor options like 'Asom' (a variation of Assam) or states like Tripura (which is surrounded by Bangladesh on three sides) to test your precision. A common mistake is grouping all North-Eastern states together under a single 'border' umbrella; however, a disciplined aspirant remembers that while Tripura and Assam have multiple border points with Bangladesh, Manipur belongs to the Myanmar-bordering block. As noted in Geography of India by Majid Husain, understanding these Political Aspects is vital for any question involving India’s complex neighborhood relations.