Saint Martin's Island

Saint Martin's Island Marine Protected Area encompasses the waters surrounding Saint Martin's Island, the only coral island of Bangladesh, located in the northeastern Bay of Bengal approximately 9 kilometres south of the Teknaf peninsula at the southernmost tip of the country. The marine protected area covers approximately 1,743 square kilometres (672 square miles), representing about 1.5 percent of Bangladesh's exclusive economic zone, and was established to protect the island's coral reefs, marine biodiversity, and sea turtle nesting habitat. Saint Martin's Island itself is a small, low-lying island of roughly 8 square kilometres situated at the confluence of the Bay of Bengal and the lower Naf River estuary near the Myanmar border. The island supports a unique assemblage of marine and coastal ecosystems including fringing coral reefs, seagrass beds, mangrove patches, sandy beaches, and rocky intertidal areas. Both the island and its surrounding marine environment are critically important for biodiversity conservation in the Bay of Bengal region.

Saint Martin's Island and its surrounding waters support exceptional marine and coastal biodiversity. The marine protected area encompasses diverse ecosystems including coral reefs that host around 66 coral species, seagrass beds, and open water habitats supporting 240 species of fish, 187 species of oysters and molluscs, and 29 species of reptiles including endangered sea turtles. Olive ridley sea turtle uses the island's beaches as a critical nesting ground, and hawksbill and green turtles have also been recorded. Dolphins and other marine mammals frequent the surrounding waters. The island's coastal habitats support 120 bird species, including both resident seabirds and migratory species. The coral reef community, though severely degraded from historical levels, continues to provide habitat for diverse reef fish and invertebrate communities. The shallow nearshore waters support fisheries that are economically vital to the island's resident population and to fishing communities throughout the Cox's Bazar region.

Saint Martin's Island supports a range of coastal and marine vegetation communities that contribute to the ecological function of the marine protected area. Marine macroalgae, with 153 species recorded, are abundant on and around the reef structures and rocky intertidal zone, providing food and habitat for diverse invertebrate communities. Seagrass meadows in the sheltered lagoon and nearshore areas provide nursery habitat for juvenile fish and feeding grounds for sea turtles. Mangrove patches occur along sheltered coastal margins of the island and on associated smaller islets and sandbanks, contributing to coastal protection and providing habitat for fish and invertebrates in the inter-tidal zone. The island's terrestrial vegetation includes coastal scrub, beach vegetation adapted to salt spray and sandy soils, and gardens and agricultural plots maintained by the island's resident community. The combination of reef algae, seagrass, mangrove, and terrestrial vegetation creates a mosaic of habitat types supporting the island's high overall biodiversity.

Saint Martin's Island is Bangladesh's only coral island and is geologically distinct from the deltaic sedimentary mainland, being composed primarily of biogenic carbonate material derived from coral growth, shell accumulation, and marine organism remains rather than river-borne silts and clays. The island is low-lying, with much of its surface just above sea level, and is underlain by a platform of coral limestone and compacted shell material. The fringing reef surrounding the island represents the structural foundation of the marine ecosystem, built up by coral growth over centuries. The island sits on the continental shelf of the Bay of Bengal in a zone where the seafloor is relatively shallow. The geological youth of the island and its biogenic origin make it particularly vulnerable to sea-level rise, as the rate of coral carbonate production must keep pace with rising water to maintain island elevation. The erosion of coral reef structure through bleaching, physical damage, and reduced calcification rates due to ocean acidification and warming threatens the geological foundation of the island.

Saint Martin's Island experiences a tropical monsoon climate moderated by its maritime position in the northern Bay of Bengal. The island is warm throughout the year, with temperatures rarely falling below 20 degrees Celsius (68 degrees Fahrenheit) even in the coolest months. The southwest monsoon from May to October brings heavy rainfall and rough sea conditions that limit boat access and visitor activity on the island. The northeast monsoon from November to March delivers drier, calmer conditions and is the primary tourist season. The island and surrounding marine area are exposed to tropical cyclones generated in the Bay of Bengal, which can cause severe damage to coral reefs through wave action, sedimentation, and temperature stress. Ocean temperature in the surrounding Bay of Bengal is warm, supporting coral growth but also posing the risk of coral bleaching during periods of anomalously high sea surface temperatures. Rising sea surface temperatures associated with climate change are among the most serious threats to the island's coral ecosystem.

Saint Martin's Island has been inhabited by Bengali Muslim fishing communities for several centuries, with families tracing their settlement to migrations from the Cox's Bazar mainland region. The island was known historically by local fishermen who used it as a fishing base and shelter during monsoon voyages in the Bay of Bengal. The British colonial administration knew the island as Narikel Jinjira, meaning 'coconut island,' reflecting the historical abundance of coconut palms. The island was incorporated into British India and subsequently into East Pakistan and then Bangladesh following independence in 1971. The resident population has grown substantially in recent decades along with increasing economic activity driven by fishing and tourism. The island's isolation and distinct maritime character have shaped a community with strong ties to the sea, fisheries, and the unique ecological setting of the Bay of Bengal. Cross-border connections with Myanmar have historically been part of the island's trade and social networks.

Saint Martin's Island and its surrounding waters have been subject to environmental protection measures for several decades, reflecting early recognition of the ecological significance of Bangladesh's only coral island. The island was declared an Ecologically Critical Area by the Bangladesh government, one of several coastal and inland zones receiving this designation. The marine protected area encompassing the island's surrounding waters was established with support from international conservation organisations including the Wildlife Conservation Society, recognising the global significance of the coral reef ecosystem and sea turtle nesting habitat. The establishment of a formal marine protected area covering 1,743 square kilometres represents a major step in Bangladesh's marine conservation policy. However, enforcement of protection measures has been challenging given the extensive area, the economic dependence of local communities on fishing, and the pressures from mass tourism that has developed rapidly since the 1990s.

Saint Martin's Island is one of Bangladesh's most popular tourist destinations, attracting visitors for its beaches, coral reef snorkelling and diving, fresh seafood, and the scenic beauty of the Bay of Bengal landscape. The island is small enough to explore on foot or by bicycle, and walking around the perimeter provides views of the reef, rocky intertidal areas, fishing activity, and the distinctive character of the island village. Snorkelling over the fringing reef, despite its degraded condition relative to historical levels, still offers encounters with colourful reef fish and invertebrates. The beaches attract visitors for swimming and relaxation, and the island's sunsets are widely celebrated for their beauty. Sea turtle nesting occurs on certain beaches during the appropriate season. Boat trips around the island and to nearby smaller islets and sandbars are popular. The island is accessible by ferry from Teknaf during the tourist season from October to March, with services suspended during the rough weather of the monsoon.

Saint Martin's Island is accessible by passenger ferry from Teknaf, the southernmost town on the Bangladesh mainland, with a journey time of approximately three hours. Teknaf can be reached from Cox's Bazar, which has an airport with connections to Dhaka. The tourist season runs from October to March, when weather and sea conditions permit regular ferry services; the island is largely cut off during the monsoon season from May to September. The island has a range of guesthouses and hotels catering to the substantial tourist market, though accommodation quality varies considerably. Fresh seafood restaurants are abundant. The island has limited freshwater resources and electricity, creating infrastructure constraints on visitor numbers. Day trips and overnight stays are both popular. Visitors should be aware that the island's ecology is under severe stress and responsible tourism practices including avoiding reef damage and not purchasing coral souvenirs are important for conservation.

Saint Martin's Island faces one of the most severe conservation crises among Bangladesh's protected areas. Coral cover declined dramatically between 1980 and 2018, with the number of coral species falling from over 140 to around 41 and total reef area shrinking by approximately 70 percent. The primary drivers of reef degradation include uncontrolled tourism development on and around the island, physical damage to coral from boats and divers, extraction of coral and shells as souvenirs and building materials, water pollution from inadequate sewage treatment, overfishing that disrupts reef food webs, and rising sea surface temperatures causing coral bleaching. Sea turtle nesting habitat is threatened by tourist disturbance and artificial lighting. The establishment of the marine protected area provides a legal framework for conservation, but enforcement over the vast surrounding ocean area requires significant resources. Conservation priorities include strict regulation of tourist numbers and behaviour, prohibition of reef-damaging activities, protection of turtle nesting beaches, and community engagement to develop sustainable fishing practices.