Siliguri Corridor
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 after the partition of 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.
Geography
The dimensions of the corridor are a matter of interpretation. Descriptions give it an area of with the narrowest section being. Kamal Jit Singh places the length at with a width of, giving it an area of approximately.Another description places its dimensions as approximately in length and wide, also giving it an area of approximately.
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.
Vulnerability mitigation by India
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 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, 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. Additionally, the old metre gauge line connects Siliguri Junction with Islampur in the North Dinajpur district of West Bengal, via Bagdogra 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 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 and the National Socialist Council of Nagaland.
- Advanced defensive assets are already stationed in the area also includes air defense systems, 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 :
- * Lachit Borphukan Military Station at Bamuni. This is the first major Army base near the Bangladesh border in Assam.
- * Forward Bases at Kishanganj and Chopra, which are intended for rapid troop deployment and intelligence coordination.