As BSF mulls 90-km Sundarbans fence, security clashes with ecology

The Border Security Force's (BSF) proposal to study a 90-km stretch of the Sundarbans mangrove forests for fencing along the Indo-Bangladesh border epitomizes the complex interplay between national security and ecological preservation in India's border management strategy. This development emerges against the backdrop of India's 4,096-km border with Bangladesh — the longest international land boundary India shares with any neighbour — where riverine terrains, chars (riverine islands), and dense mangrove forests have historically facilitated illegal infiltration, cattle smuggling, and trans-border crimes. The Sundarbans, a UNESCO World Heritage Site since 1987 and a Ramsar Wetland since 2019, straddles the southern fringe of West Bengal and Bangladesh's Khulna division, forming the world's largest contiguous mangrove ecosystem spanning approximately 10,000 sq km, of which 4,260 sq km lies in India. The security imperative is clear: the difficult terrain of the Sundarbans, with its intricate network of tidal creeks, mudflats, and dense vegetation, has long been exploited by infiltrators and smuggling networks. The BSF, raised in 1965 under the Border Security Force Act, 1968, and functioning under the Ministry of Home Affairs (MHA), is mandated under Article 355 of the Constitution to protect states against external aggression and internal disturbance. Fencing has been a cornerstone of India's border management doctrine — over 3,300 km of the Indo-Bangladesh border has already been fenced, significantly reducing infiltration in secured stretches. However, the Sundarbans presents unique engineering and ecological challenges: the tidal amplitude of 3-5 metres, saline water corrosion, shifting river courses, and the absence of stable landmass make conventional fencing technically unviable and financially prohibitive. Ecologically, the stakes are equally high. The Indian Sundarbans, notified as a Tiger Reserve in 1973 under Project Tiger (now subsumed under the National Tiger Conservation Authority via the Wildlife Protection Act, 1972), hosts an estimated 100 Royal Bengal Tigers — the only mangrove-dwelling tiger population globally. It also shelters the estuarine crocodile, Gangetic dolphin, and numerous migratory bird species. The mangroves act as a critical bioshield: during Cyclone Amphan (May 2020) and Cyclone Yaas (May 2021), the Sundarbans absorbed storm surges, protecting Kolkata and the densely populated South 24 Parganas district. Any physical barrier risks fragmenting tiger corridors, disrupting tidal hydrology essential for mangrove regeneration, and violating India's commitments under the Convention on Biological Diversity (1992), the Ramsar Convention (1971), and the UNESCO World Heritage Convention (1972). Domestically, the Forest Conservation Act, 1980 (amended 2023), the Environment (Protection) Act, 1986, and the Coastal Regulation Zone Notification, 2019, impose strict regulatory scrutiny on any developmental activity in such ecologically sensitive areas. The stakeholders are multi-layered: the MHA and BSF prioritize border integrity; the Ministry of Environment, Forest and Climate Change (MoEFCC) and West Bengal Forest Department advocate ecological integrity; local communities — honey collectors, fishermen, and woodcutters — depend on forest access for livelihoods; and Bangladesh, with whom India shares a robust bilateral relationship elevated to a "strategic partnership" in 2015, has its own security and environmental concerns in the shared ecosystem. The 2011 Land Boundary Agreement (LBA) and the 2015 Coastal Shipping Agreement reflect the maturity of Indo-Bangladesh ties, but unresolved issues like the Teesta water sharing and border killings periodically strain relations. Broader themes emerge: the tension between Article 21 (right to life, encompassing a clean environment per Supreme Court jurisprudence in Subhash Kumar v. State of Bihar, 1991) and Article 355 (duty to protect against external aggression); the federal dimension where border management is a Union subject (Entry 1, Union List) but forests fall under the Concurrent List (Entry 17-A); and the climate security nexus where mangroves are "blue carbon" sinks critical for India's NDC under the Paris Agreement (2015) to create an additional carbon sink of 2.5-3 billion tonnes CO2 equivalent by 2030. Future implications hinge on the BSF's feasibility study. Technological alternatives — drone surveillance, satellite-based monitoring (using ISRO's RISAT and Cartosat series), sensor grids, and smart fencing (laser walls, thermal imaging) — already deployed in parts of the Indo-Pak and Indo-Bangladesh borders, may offer a middle path. The Comprehensive Integrated Border Management System (CIBMS), launched in 2017, exemplifies this tech-forward approach. Any decision will require clearance from the National Board for Wildlife (NBWL), the Forest Advisory Committee (FAC), and potentially the Supreme Court's Central Empowered Committee (CEC). For aspirants, this case study encapsulates the governance challenge of balancing hard security with soft ecological infrastructure — a recurring theme in India's borderlands from the Himalayas to the Sundarbans.