From the Siliguri Corridor to the Bay of Bengal, India’s eastern frontier now defines security, connectivity, trade, and geopolitical resilience against rising regional tensions
West Bengal has never been merely a state. It is a civilisational frontier, a geographic sentinel, and now — following its historic electoral verdict in May 2026 — a renewed theatre of strategic consolidation for India at one of the most dangerous moments in its post-independence history. The geography alone commands respect.
The Siliguri Corridor — the narrow strip of land in West Bengal that connects mainland India to eight northeastern states — stretches approximately 60 km in length and narrows to just 17–22 km at its most constricted point. Any disruption here could effectively cut off a region covering roughly 8% of India’s territory and home to nearly 45 million people. The military significance of this Chicken’s Neck emerges directly from its proximity to international borders with China, Nepal, and Bangladesh, three neighbors whose strategic postures have each shifted adversarially in recent years.
Bhutan guards the northern flank with goodwill; everything else around the corridor is in flux. China’s continuing road and airstrip construction activities on its side of the border represent a constant threat, as the infrastructure could allow the PLA to mobilise rapidly in the region. The Doklam crisis of 2017 was a forewarning; it was not resolved, merely deferred. To the south and east, the transformation of Bangladesh has been swift and alarming. The 4,097 kilometres of shared border between India and Bangladesh, spanning West Bengal, Assam, Meghalaya, Tripura, and Mizoram, represents a critical strategic frontier that shapes regional power dynamics and security architectures.
Since the ouster of Sheikh Hasina in August 2024, that frontier has become porous in ways that India’s strategic community is only beginning to fully reckon with. The Yunus-led administration has found solid backing from China — a country that counts Bangladesh among crucial geostrategic spots in South Asia — while simultaneously warming to Pakistan in ways that would have been inconceivable under Hasina. The ISI’s physical footprint near the corridor is now confirmed, not speculated. The movement of Pakistani ISI officers to Bangladesh’s Rangpur division — a mere 130 kilometers from the Siliguri Corridor — in January 2025, coming on the heels of a Bangladeshi military delegation’s visit to Rawalpindi and meetings with Pakistan’s Army Chief and ISI Director, suggests pre-planning and coordination at the highest levels.
This is not routine military diplomacy. It is a strategic probe of India’s most exposed nerve. West Bengal, therefore, is the fulcrum on which India’s northeastern security architecture balances. But it is also something else: a gateway. The Bay of Bengal is emerging as one of the Indo-Pacific’s most contested maritime spaces, and Kolkata — along with the Haldia-Sagar port complex — represents India’s primary eastern seaboard access point.
The BIMSTEC framework, India’s Act East policy, and the imperative of connecting landlocked northeastern states to maritime trade all converge on West Bengal’s coastline and river systems. A state unable to enforce law and order internally, or one whose government is at perpetual loggerheads with New Delhi, cannot serve as the effective anchor of this eastern economic architecture. This is where the political change of May 2026 acquires strategic significance beyond electoral arithmetic.
For fifteen years, West Bengal’s governance under AITMC was marked by a structural antagonism with the Centre that compromised border management, slowed the National Register of Citizens process, complicated BSF operational jurisdiction, and allowed demographic shifts in border districts to proceed with minimal state-level scrutiny. Whatever the social welfare achievements of the Mamata Banerjee era — and they were real — the state-Center friction on security matters created operational gaps that adversaries proved willing to exploit.
A BJP government in Kolkata, aligned with the NDA dispensation in New Delhi, eliminates this friction at a moment of maximum external pressure. The convergence is not incidental. After Operation Sindoor, national security agencies significantly tightened security along the Chicken’s Neck, with fresh intelligence inputs prompting additional force deployments to prevent potential infiltration by terrorists, a response that requires seamless coordination between state police, BSF, and central intelligence agencies. That coordination is now structurally possible in a way it has not been since 2011.
The Arakan Army’s consolidation in Myanmar’s Rakhine State adds another layer of urgency. The displacement of Rohingya populations, the weakening of Myanmar’s central state, and the possibility of insurgent networks using the Bangladesh-Myanmar-West Bengal triangle as a logistics corridor are scenarios that India’s security planners are watching with deep concern. West Bengal’s eastern districts, Bengal’s own Rohingya settlements, and the porous character of riverine borders all demand a state government with both the will and the central backing to act.
Geostrategy and geoeconomics in West Bengal are not alternatives; they are complementary imperatives. The world watching this transition — from Dhaka to Naypyidaw, from Beijing to Islamabad — will register what India does next in this state. The Siliguri Corridor is too narrow, the Bay of Bengal too consequential, and the neighbourhood too unsettled for West Bengal to remain, as it has for too long, a strategic afterthought in New Delhi’s calculations. The election of May 2026 has at minimum created the political preconditions for change. Whether the new dispensation in Kolkata rises to the full weight of its geography remains the defining question of the next five years.
(Dr Nandkumar M Kamat, who has a doctorate in microbiology, is a scientist and a science writer)
