The Siliguri Corridor, often dubbed the "Chicken's Neck", is a stretch of land around the city of Siliguri in West Bengal state of India. It is the sole terrestrial connection between India's mainland and its eight northeastern states, serving as a logistical lifeline for over 40 million people and crucial military movements. Bordered by Nepal, Bhutan and Bangladesh, it lies close to Tibet's Chumbi Valley to its northeast. The city of Siliguri is the major city in the area and the central transfer point connecting Bhutan, Nepal, Bangladesh, Sikkim, Darjeeling, Northeast India and mainland India.
History
The partition of India led to the formation of the Siliguri Corridor through the creation of East Pakistan (now Bangladesh) after the partition of Bengal (into East Bengal and West Bengal) in 1947–1948.
The Kingdom of Sikkim formerly lay on the northern side of the corridor, until its union with India in 1975 via a publicly held referendum. From Sikkim, India consolidated its control of the Chumbi Valley, along with Bhutan.
The dimensions of the corridor are a matter of interpretation. Descriptions give it an area of 170 by 60 km (106 by 37 mi) with the narrowest section being 20–22 km (12–14 mi). Kamal Jit Singh places the length at 200 km (120 mi) with a width of 17 to 60 km (11 to 37 mi), giving it an area of approximately 12,200 km2 (4,700 sq mi).
Another description places its dimensions as approximately 200 km (120 mi) in length and 20 to 60 km (12 to 37 mi) wide, also giving it an area of approximately 12,200 km2 (4,700 sq mi).
The corridor is located between Bangladesh to the southwest, Nepal on the northwest, and Bhutan to the north. Between Sikkim and Bhutan lies the Chumbi Valley Tibetan territory. The southern end of the Dolam plateau or Doklam tri boundary area slopes into the corridor. At the narrowest stretch, the corridor is generally formed by the Mechi River in the east; Nepal's Bhadrapur lies on the banks of the river. Further north the Mechi Bridge connects Mechinagar.
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Reference material for this entry is drawn from the open encyclopedic record, including Wikipedia , available under the CC BY-SA 4.0 license. Images are credited individually beside each photo.
To mitigate the vulnerability India has undertaken several initiatives including enhancing security deployment as well as undertaking infrastructure development. To ensure seamless connectivity and military mobilization, India has prioritized developing high-capacity infrastructure in and around the corridor, notably under the Bharatmala Pariyojana. Projects include:
Corridor Enhancement: Upgrading of major broad-gauge railway lines and highways to increase freight capacity and reduce transit time.
Alternative Routes: Exploration and development of alternative connectivity solutions to reduce reliance on the single-access corridor, including the proposed Hili–Mahendraganj Corridor and the Kaladan Multimodal Transit Corridor through Myanmar.
Future Infrastructure: Consideration of subterranean infrastructure (tunnels) within the corridor to enhance security and reduce exposure to external threats.
Connectivity
India has embarked on a slew of projects. These include the construction of India-China Border Roads, where, as of 2024, multiple phases of border roads have been constructed, and Advance Landing Grounds (ALGs), such as the Nyoma Advanced Landing Ground, which is nearing completion as of 2024. Other projects include Northeastern India connectivity and Look-East transnational connectivity projects including BIMSTEC and BBIN to create multiple alternatives to Silliguri corridor, including through Bangladesh and the sea.
All land transportation between the rest of India and its far northeastern states uses this corridor. The route has a major broad gauge railway line. Electrification of this double-track corridor is in progress with assistance from the Central Organization for Railway Electrification (CORE). Additionally, the old metre gauge line (recently converted to a 1.676 metres (5 ft 6.0 in) broad-gauge line) connects Siliguri Junction with Islampur in the North Dinajpur district of West Bengal, via Bagdogra (the only airport of national interest in the corridor) and the bordering towns of Adhikari, Galgalia, Thakurganj, Naxalbari and Taiabpur with Nepal. As of 2024, to reduce dependence on the Siliguri Corridor, India is planning to build railway lines through Jogbani in Bihar, which would enter Biratnagar in Nepal and then connect with New Mal Junction in West Bengal. India is also developing railway lines through Bangladesh, which includes constructing new railway tracks and the gauge conversion of existing railway tracks, in order to reduce dependence on the Siliguri Corridor, as of 2024.
As of 2024, there is no free-trade agreement between Bangladesh and India. The Tetulia Corridor, an alternative to the Siliguri Corridor, is proposed under Article VIII of the India–Bangladesh Trade Agreement 1980, which states that "The two governments agree to make mutually beneficial arrangements for the use of their waterways, railways and roadways for commerce between the two countries and for passage of goods between two places in one country through the territory of the other". However, the opening of the Tetulia Corridor is still being discussed politically as of 2019.
Security
The threat of a Chinese advance is still considered by Indian planners. A Chinese military advance of less than 130 km (81 mi) would cut off Bhutan, part of West Bengal and all of North-East India, an area containing almost 50 million people. This situation arose during the war between India and China in 1962. The security threat to this corridor was heightened during the 2017 Doklam incident. The probability of China cutting off seven states in northeast India has been questioned. The Indian Army has said that the Siliguri Corridor is the Army's strongest defensive line.
Military Bases and Deployment: India has several forces stationed on the borders, the Indian Army and Indo-Tibetan Border Police man the border with China; Sashastra Seema Bal is deployed along the border with Nepal and Bhutan and the Border Security Force for Bangladesh. The strip is also patrolled by the Indian Army, the Assam Rifles, and state police forces including the West Bengal Police. The security threat posed by the corridor decreased following the creation of Bangladesh in 1971. Internal threats to the corridor are numerous. Militant groups known to have used the corridor include the United Liberation Front of Assam (ULFA) and the National Socialist Council of Nagaland (NSCN).
Advanced defensive assets are already stationed in the area also includes air defense systems (such as S-400), a BrahMos missile regiment and a squadron of Rafale fighter aircraft of the Indian Air Force's Rafale fighter aircraft based at Hasimara Air Force Station.
The corridor and the surrounding region are secured by multiple military formations, primarily Indian Army's Trishakti Corps (XXXIII Corps), which guards the corridor and Sikkim. In a significant move to reinforce the eastern frontier, India established three new military garrisons in late 2025 to boost surveillance, readiness, and coordination with the Border Security Force (BSF):
Lachit Borphukan Military Station at Bamuni (near Dhubri, Assam). This is the first major Army base near the Bangladesh border in Assam.
Forward Bases at Kishanganj (Bihar) and Chopra (West Bengal), which are intended for rapid troop deployment and intelligence coordination.
Related Chicken's necks
Counter Chicken-neck corridors and their relevance
Anti-India hardliners in Bangladesh and Pakistan refer to Siliguri Corridor as India's Chicken's neck, while both nations have their own more vulnerable chicken's necks along the respective border with India. This is a significant relevance. If Pakistan or Bangladesh try to exploit India's chicken neck vulnerability, India can exploit their vulnerability in their similar respective Chicken neck corridors. This way India can impose geopolitical symmetry of mutual vulnerability, elevate the severity of economic risks to Bangladesh, deter border brinkmanship by Bangladeshi hardliners, disrupt Bangladesh's trade through Chittagong Port which handles Bangladesh's over 90% of the international maritime trade as Bangladesh's Rangpur and Chittagong are flanked by India. Bangladeshi writer Jaidul, while acknowledging that numerous prominent Indian media outlets and senior national politicians have pointed out Bangladesh's own twin Chicken neck vulnerable areas in response to Bangladeshi Islamist hardliner's rhetorics about India's Siliguri Corridor, argues that the Indian reports about the Bangladeshi Chicken necks are also rhetorics. However, Indian geostrategic think tanks and analysts, such as Karnad, point out that in case of any misadventure by Bangladesh India can annex the Rangpur Division which is one of the two chicken neck vulnerabilities of Bangladesh, or India can offer to buy it for $10-$20 billion thus helping Bangladesh reduce its outstanding debt of $104 billion), alternatively Bangladesh could provide "an absolute and enforceable guarantee with a treaty that it will not, under any circumstances, create a strategic nexus or work militarily in concert with China (or Pakistan)".
Security analysts, like Dr Shahnawaz of Islamic University of Science & Technology, highlight that Bangladesh obtained its independence from Pakistan with the help of India, both have shared historic cultural and geographical ties due to which change in one nation affects other, thus influx of Bangladeshi migrants in India is akin to expansion of Bangladesh beyond its political borders without expanding its political borders and Islamic radicalization in Bangladesh "has serious security implications on internal security of India and particularly on North east region ... subsequently these radical organizations have developed links with groups active in north east region" of India. India-Bangladesh enjoyed excellent bilateral relations during the Awami League (AL)'s rule which was disrupted after overthrow of AL's Sheikh Hasina government and anti-India rhetorics of Bangladeshi hardliners. Security of India and Bangladesh are inter-linked, both have much to gain from the peaceful stable bilateral relationship and lot to lose without it which also negatively affacts their neighbors.
According to the World Bank, both India and Bangladesh will benefit economically if they collaborate to unstrangle the Chicken's Neck by building transport corridors from Mainland India to North East India through Bangladesh, which will create jobs and also benefit neighbouring countries like Nepal and Bhutan thus ensuring mutual economic growth. This view is also supported by the United Nations's ESCAP study, which cites SAARC's Regional Multimodal Transport Study (SRMTS), that Bangladesh can tap into opportunities by being the regional connectivity and transport hub between land locked North East India, Nepal, and Bhutan.
Bangladesh
Bangladeshi National Citizen Party's leader Hasnat Abdullah has rhetorically threatened to cut off India's northeastern states by cutting off India's chicken's neck, i.e. Siliguri Corridor, while downplaying India's contribution in 1971 Bangladesh Liberation War. While India has two chicken's neck, Bangladesh also has the following two chicken's neck along its border with India. Both of these, comprising 34.2% or 50,715 km2 Bangladesh's total territory, are narrower and more vulnerable than India's Siliguri Corridor or Tripura Corridor, and contribute 30-45% to economy of Bangladesh and 80% of Bangladesh's total export-import is through Chittagong Port in this vulnerable area. In response to rhetoric from certain Bangladeshi political figures and hardliners highlighting India's "Chicken's Neck" vulnerability, Indian leaders have pointed out that Bangladesh itself possesses two narrow land corridors that are geographically isolated and potentially more vulnerable. These counter-vulnerabilities, which could be exploited in the event of aggression, are described as North Bangladesh Corridor (Rangpur Division) and Chittagong Corridor (a slender strip, reportedly 28 kilometres at its narrowest, connecting the port city of Chittagong - the economic capital- with the political capital of Dhaka). This diplomatic and strategic counter-narrative serves as a warning that any hostile action aimed at the Siliguri Corridor could result in severe repercussions for Bangladesh's own territorial integrity and economic connectivity.
Rangpur chicken's neck, the northern part of Bangladesh's Rangpur Division contiguous to India's Siliguri Corridor is narrower. While Siliguri Corridor is nearly 20 km long at its narrowest section, the 80 km long northern Rangpur Division is only nearly 10 to 15 km long at its narrowest vulnerable section and making this area more vulnerable the narrowest section runs along the Karatoya River which isolates it from the rests of Bangladesh. This 16,185 km2 area, which constitutes 10.9% of Bangladesh's total area, contributes significantly to economy of Bangladesh especially in rice, jute, agriculture, food security and transport. This area is surrounded by India on three and half sides by almost 320-330 degree.
Chittagong chicken's neck, the southeastern part of Bangladesh's Chittagong Division contiguous to Northeast India is less than 20–28 km at its narrowest vulnerable section. This 34,530 km2 area, which constitutes 23.3% of Bangladesh's total area, contributes significantly to economy of Bangladesh especially because 80% of Bangladesh's export and import happens through Port of Chittagong located in this vulnerable area (remaining 20% export-import to India-Nepal-Bhutan largely happens through border with India). This area also contributes significantly to Bangladesh's economy through tourism and surface border trade. Feni River and its several tributaries including the Muhuri River, which run along the narrowest section completely isolating it from the rests of Bangladesh at multiple places, makes it more vulnerable and according to the World Bank assessment the solution lies in close collaboration between India and Bangladesh. This area is surrounded largely by India which also has insurgency-ridden Buddhist-majority Chittagong Hill Tracts in Muslim-majority Bangladesh. A smaller southern section is surrounded by the Buddhist-majority Myanmar with which Bangladesh also has Bangladeshi-origin Rohingya Muslim related conflict, while Bangladesh continues to refuse to accept Rohingya Muslims as refugees in its territory who have waged separatist insurgency against Myanmar.
Pakistan
Akhnoor Bulge (named "Akhnoor Dagger" by Pakistani Military, and as "Pakistan's Akhnoor Chicken's neck Corridor" by Indian Military) a narrow strip of Pakistani territory that extends into the Indian administered-Jammu and Kashmir south of Akhnoor. This sensitive piece of land, which lies on the de facto Indo–Pakistani border on the west side of the disputed region of Jammu and Kashmir, is part of Punjab Province's Sialkot District and measures roughly 170 km2 (66 sq mi). However, this Akhnoor Bulge being a "dagger" or India's "Chicken's Neck" vulnerability, as perceived by Pakistan in 1965, has since been described by some analysts as a strategic myth, "the so-called 'Chicken's Neck' or Akhnoor Dagger area... proved to be a liability for Pakistan rather than an asset in the 1971 war when Indian forces successfully captured the area". This is evidenced by India's swift 1971 capture of the area, which effectively negated the perceived threat to Akhnoor. Any perceived vulnerability of India is further mitigated by improved infrastructure development by India, which now has many more high-capacity bridges and numerous alternate transport links connecting Jammu to Akhnoor and India to wider Jammu and Kashmir region, providing redundancy and resilience to the military supply lines. In fact, the area has been argued to be a Pakistani vulnerability, as the land is a narrow doab between the Chenab and Tawi rivers surrounded by India from three sides, and is further doubly-isolated from the rest of Pakistan by the Chenab–Munawar Tawi doab to its southwest within Pakistan.
In popular culture
Humphrey Hawksley, in his 2000 novel Dragon Fire, briefly authors a situation where China cuts off India's land route to its northeastern territories. Assassin's Mace (2011) by Brigadier Bob Butalia also involves such a situation involving Doklam and Jaldhaka River.
