Which one of the following states of India is surrounded by Bangladesh on three sides ?

1. Overview of India's International Land Borders (basic)

India’s land frontier is one of the most diverse and complex in the world, stretching approximately 15,200 km Geography of India, Majid Husain, India–Political Aspects, p.28. This massive perimeter connects India with seven different countries, each sharing a unique historical and geographical relationship. Starting from the northwest and moving clockwise, India shares borders with Pakistan, Afghanistan, China, Nepal, Bhutan, Myanmar, and Bangladesh. These borders aren't just lines on a map; they are shaped by rugged mountain ranges like the Himalayas in the north and dense tropical forests in the east.

The distribution of these borders is quite uneven. For instance, the border with China (approx. 3,488–3,917 km) is characterized by harsh climates and high-altitude terrain, making physical demarcation difficult. In the Eastern Sector, this boundary is famously known as the McMahon Line, established in 1914 Geography of India, Majid Husain, India–Political Aspects, p.34. On the other hand, the border with Bangladesh is the longest, measuring about 4,096.7 km. This specific border was recently refined through the 100th Constitutional Amendment Act to resolve long-standing enclave disputes Introduction to the Constitution of India, D. D. Basu, Territory of the Union, p.76.

One of the most fascinating geographical features of India’s political map is the state of Tripura. It is almost entirely enclosed by Bangladesh, sharing about 84% of its border (856 km) with the neighboring country on its north, south, and west sides. While states like West Bengal share a longer total distance with Bangladesh, Tripura is unique because it is effectively a "peninsula" of Indian territory jutting into Bangladesh, connected to the Indian mainland only through Assam and Mizoram on its eastern flank.

Neighboring Country	Key Characteristics
Bangladesh	Longest land border; involves the 100th Amendment; surrounds Tripura on three sides.
China	Second longest; includes the McMahon Line (Eastern Sector); high-altitude terrain.
Pakistan	Western frontier; legacy of the 1947 Radcliffe Award; site of frequent security concerns.

Sources: Geography of India (Majid Husain), India–Political Aspects, p.28; Geography of India (Majid Husain), India–Political Aspects, p.34; Introduction to the Constitution of India (D. D. Basu), Territory of the Union, p.76

2. Political Geography of Northeast India (basic)

The North Eastern region of India is one of the most geographically unique and strategically sensitive parts of the country. Historically, the region was referred to as the 'Seven Sisters', comprising Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, and Tripura. In more recent years, Sikkim was integrated into the regional council, and it is now affectionately referred to as the 'Brother' to these seven states Politics in India since Independence, Regional Aspirations, p.126. Despite covering a significant landmass—roughly twice the proportion of its population share—the entire region is connected to mainland India by a remarkably narrow strip of land in West Bengal known as the Siliguri Corridor (or the 'Chicken's Neck'), which is only about 22 kilometers wide Politics in India since Independence, Regional Aspirations, p.126.

One of the most fascinating political-geographical features of this region is the state of Tripura. While several states share borders with Bangladesh (including West Bengal, Meghalaya, Mizoram, and Assam), Tripura's position is extraordinary. It is surrounded by Bangladesh on three sides—the north, south, and west. Approximately 84% of Tripura's total border length (about 856 km) is an international boundary with Bangladesh. This makes the state almost like an Indian peninsula jutting into a foreign neighbor, connected to the rest of India only through narrow passages via Assam and Mizoram on its eastern side.

The political map we see today was largely shaped by the North-Eastern Areas (Reorganisation) Act of 1971. Before this, many of these areas were Union Territories or part of a larger Assam province. In 1972, a major shift occurred when the Union Territories of Manipur and Tripura, along with the sub-state of Meghalaya, were granted full statehood Indian Polity, Union and Its Territory, p.55. This reorganization was crucial for addressing regional aspirations and ensuring better administrative focus on these border-heavy states.

Sources: Politics in India since Independence, Regional Aspirations, p.126; Indian Polity, Union and Its Territory, p.55

3. India-Bangladesh Border Profile (intermediate)

To understand India's political geography, we must start with its most extensive land frontier: the India-Bangladesh border. Stretching approximately 4,096.7 kilometers, this is the longest international border India shares with any neighbor, exceeding even the borders with China and Pakistan Majid Husain, Geography of India, India–Political Aspects, p.28. This boundary is a legacy of the 1947 Partition (originally the Radcliffe Line) and was later reaffirmed following the liberation of Bangladesh in 1971. Because Bangladesh is almost entirely encircled by Indian territory, the relationship between these two nations is geographically and geopolitically inseparable Majid Husain, Geography of India, India–Political Aspects, p.62.

Five Indian states share this massive border, each with a different geographical relationship to Bangladesh:

• West Bengal: Shares the longest stretch (about 2,217 km).
• Tripura: Highly unique because it is surrounded by Bangladesh on three sides (North, South, and West), with nearly 84% of its total perimeter being international.
• Meghalaya: Lies to the north of Bangladesh.
• Mizoram: Shares a border on the southeastern flank of Bangladesh.
• Assam: Shares two non-contiguous stretches of the border.

Geographically, the border is exceptionally complex. It is not defined by high mountain ranges like the Himalayas, but rather by shifting river channels, fertile plains, and dense jungles. For instance, in areas like Murshidabad (India) and Rajshahi (Bangladesh), the fluctuating course of the Ganga River has historically led to overlapping territorial claims and administrative challenges Majid Husain, Geography of India, India–Political Aspects, p.42. This 'porous' nature of the border—meaning it is easy to cross due to the terrain—makes it a focal point for discussions on migration, trade, and security.

Sources: Geography of India (Majid Husain), India–Political Aspects, p.28, 42, 62; Contemporary India-I (NCERT Class IX), India Size and Location, p.4

4. Strategic Geography: The Siliguri Corridor (intermediate)

The Siliguri Corridor, popularly known as the "Chicken's Neck," is perhaps the most strategically sensitive piece of geography in India. This narrow stretch of land, located in the state of West Bengal, measures only about 20 to 22 kilometers at its narrowest point. It serves as the sole land bridge connecting mainland India to its eight North-Eastern states (the "Seven Sisters" and Sikkim). Without this corridor, the North-East would be geographically isolated from the rest of the country, as it is otherwise surrounded by international borders with Nepal, Bhutan, China, Myanmar, and Bangladesh.

The geopolitical sensitivity of this area arises from its proximity to foreign powers. To the north lies the Chumbi Valley of Tibet (China), to the west is Nepal, and to the south is Bangladesh. This makes the corridor a classic "bottleneck." Any military disruption here could theoretically "sever" the North-East from the Indian union. This vulnerability was highlighted during the 2017 Doklam standoff, where Chinese attempts to construct a road near the Bhutan-India-China tri-junction were seen as a direct threat to the security of the Siliguri Corridor Rajiv Ahir, A Brief History of Modern India, After Nehru, p.793. The proximity of the Chumbi Valley allows a potential adversary to exert pressure on this thin strip of Indian territory with relatively short-range movements.

Beyond military threats, the corridor faces significant environmental and infrastructural challenges. The region falls under a Very High Vulnerability Zone for natural disasters, particularly landslides and earthquakes, due to its location in the young, unstable Himalayan foothills India Physical Environment (NCERT Class XI), Natural Hazards and Disasters, p.66. A major landslide or seismic event could cripple the vital rail and road links—such as National Highway 10 and the New Jalpaiguri railway hub—that transport essential goods and personnel to the frontier states. To mitigate this "single-point failure" risk, India has been actively pursuing alternative connectivity projects, such as the Kaladan Multi-Modal Transit Transport Project through Myanmar and the Chittagong Port agreements with Bangladesh.

Sources: A Brief History of Modern India, After Nehru..., p.793; India Physical Environment (NCERT Class XI), Natural Hazards and Disasters, p.66

5. Trans-boundary Connectivity and 'Act East' Policy (exam-level)

The 'Act East' Policy represents a paradigm shift from the earlier 'Look East' approach, moving from mere diplomatic signaling to proactive economic and strategic engagement with Southeast Asia. At the heart of this policy lies India's Northeast, which serves as a land bridge to the ASEAN region. However, the geography of this region presents a unique challenge: the 'Geography of Constraint'. Most Northeastern states are connected to mainland India only through the narrow 22-km Siliguri Corridor (the 'Chicken’s Neck'). This isolation was historically exacerbated by the 1947 Partition, which saw the loss of the strategic Chittagong port to then East Pakistan INDIA PEOPLE AND ECONOMY, TEXTBOOK IN GEOGRAPHY FOR CLASS XII, International Trade, p.90. Consequently, states like Tripura became geographically disadvantaged, surrounded by Bangladesh on three sides (North, South, and West), with nearly 84% of its border being international.

To overcome this isolation, India is focusing on Trans-boundary Connectivity. Instead of relying solely on the congested and silt-prone ports like Kolkata and Haldia INDIA PEOPLE AND ECONOMY, TEXTBOOK IN GEOGRAPHY FOR CLASS XII, International Trade, p.92, the goal is to create integrated networks that treat borders as 'gateways' rather than 'fences'. Projects like the Agartala-Akhaura rail link and the use of Bangladesh's Chittagong and Mongla ports are transformative. These initiatives align with the philosophy that infrastructure in such sensitive regions is a nation-building exercise rather than just a transport project, as the long-term sustainability benefits are diffused across the entire economy Indian Economy, Vivek Singh (7th ed. 2023-24), Infrastructure and Investment Models, p.414.

Feature	Look East Policy (1991)	Act East Policy (2014)
Focus	Economic integration with ASEAN.	Economic + Security + Strategic + Cultural.
Role of NE India	A peripheral region to be protected.	A proactive gateway to Southeast Asia.
Connectivity	Limited to domestic infrastructure.	Trans-boundary (e.g., Trilateral Highway, BBIN).

Integrating these regions through multimodal transport—incorporating road, rail, and inland waterways—is essential for regional development Geography of India, Majid Husain, Regional Development and Planning, p.75. For a state like Tripura, which shares an 856 km border with Bangladesh, trans-boundary connectivity isn't just an option; it is a geographic necessity for survival and growth.

Sources: INDIA PEOPLE AND ECONOMY, TEXTBOOK IN GEOGRAPHY FOR CLASS XII, International Trade, p.90; INDIA PEOPLE AND ECONOMY, TEXTBOOK IN GEOGRAPHY FOR CLASS XII, International Trade, p.92; Indian Economy, Vivek Singh (7th ed. 2023-24), Infrastructure and Investment Models, p.414; Geography of India, Majid Husain, Regional Development and Planning, p.75

6. Geographic Isolation and Orientation of Tripura (exam-level)

To understand the unique political geography of Tripura, one must visualize it as an almost-enclaved 'peninsula' of land jutting into its neighbor. While several Indian states share a boundary with Bangladesh, Tripura's orientation is unique: it is surrounded by Bangladesh on three sides—the North, the South, and the West. This creates a high degree of geographic isolation, as about 84% of its total perimeter (approximately 856 km) is an international border. Geography of India, India–Political Aspects, p.42. Unlike West Bengal, which shares the longest total border with Bangladesh (over 2,216 km) but remains physically integrated with the Indian mainland to its north and west, Tripura is connected to the rest of India only through a narrow corridor on its eastern side, bordering the states of Assam and Mizoram.

Physiographically, Tripura is part of the Purvanchal hills, which are the eastern extension of the Himalayan system. Geography of India, Physiography, p.17. This rugged, forested terrain, combined with its political encirclement, historically made the state one of the most remote parts of India. This 'three-sided' international exposure is a defining feature that distinguishes it from other border states like Meghalaya (which borders Bangladesh only to the south) or Assam (which has two separate stretches of border with Bangladesh but remains internally well-connected).

The following table highlights how Tripura's orientation compares to other major states sharing this international boundary:

State	Border Orientation with Bangladesh	Unique Geographic Feature
Tripura	North, South, and West	84% of border is international; surrounded on 3 sides.
West Bengal	East	Longest total border (2,216 km) but not surrounded.
Meghalaya	South	A single continuous southern border.
Mizoram	West	Borders both Bangladesh and Myanmar.

Sources: Geography of India, India–Political Aspects, p.42; Geography of India, Physiography, p.17

7. Solving the Original PYQ (exam-level)

Review the concepts above and try solving the question.