Mono Transboundary Biosphere Reserve: A Geographic Atlas of Coastal Wetlands and Savanna Landscapes

The Mono Transboundary Biosphere Reserve was formally inscribed on UNESCO's World Network of Biosphere Reserves in 2017. Its creation reflects a joint initiative by Benin and Togo to unify protection efforts around the shared Mono river delta, a landscape that had previously been subject to separate national management. The reserve brought together existing protected areas, community lands and natural habitats spanning the border under a single transboundary framework.

On the Beninese side, oversight falls under the Ministry of Environment responsible for Climate Change, Reforestation and the Protection of Natural and Forest Resources, working with the Centre National de Gestion des Réserves de Faune (CENAGREF). On the Togolese side, the Ministry of Environment and Forest Resources (MERF) leads management, supported by the Direction des Ressources forestières (DRF). This dual structure mirrors the reserve's cross-border character and has become a defining institutional feature of the protection effort.

The landscape of the Mono Transboundary Biosphere Reserve is defined by the transition between the Mono river system and the Atlantic coast. At the coast, islands, ponds, lagoons, sandy beaches and the open sea meet within short distances, producing a finely textured shoreline geography inland of the town of Sodome in Benin. Channels of the Mono river spread through this zone, distributing freshwater and sediment into brackish and marine environments.

Moving inland, the reserve's terrain shifts into floodplains that flank the lower Mono and into drier savanna formations that cover much of the protected zone's interior. Scattered forest patches, including sacred groves, punctuate the savanna matrix and create localized pockets of dense vegetation. The combined effect is a landscape where coastal, wetland and dryland environments all form part of a single continuous geographic system.

Ecologically, the reserve is notable for the breadth of habitat types packed into its boundaries. Mangroves fringe the brackish reaches near the coast, while the river and its associated channels and lagoons support extensive freshwater and estuarine systems. Inland, seasonal floodplains give way to savanna grasslands that sustain different plant and animal communities adapted to drier conditions. Patches of forest, including sacred forests, add further structural diversity to the habitat mosaic.

This combination of marine influence, river dynamics, wetlands and savanna makes the reserve a transitional zone where multiple West African ecosystems overlap. The result is a high degree of ecological variability across the reserve, supporting species groups associated with coastal wetlands, freshwater systems and dryland savanna within a single protected unit.

The conservation significance of the Mono Transboundary Biosphere Reserve lies in its formal UNESCO recognition and in its role as a coordinated cross-border framework for protecting a shared delta system. The reserve safeguards mangrove, lagoon and floodplain ecosystems that are ecologically sensitive and vulnerable to upstream changes in the Mono river as well as coastal pressures. Designation as a biosphere reserve places the area within an international network that emphasizes both ecological protection and sustainable human land use.

By unifying management on both sides of the border, the reserve also addresses governance fragmentation, an important conservation concern for transboundary ecosystems. The involvement of national environment agencies in both Benin and Togo, along with referenced technical studies on biodiversity conservation, suggests active engagement with the reserve's ecological monitoring and protection needs.

The reserve encompasses communities whose cultural practices are closely tied to the landscape. Sacred forests within the savanna matrix are a notable cultural feature, reflecting traditional relationships between local communities and specific forest patches that have been preserved through religious and customary protections. Fishing, agriculture and other resource-based livelihoods also shape the cultural identity of populations living along the Mono river and its delta.

Highlights of the Mono Transboundary Biosphere Reserve include its unusual cross-border governance model, its internationally recognized status as a UNESCO biosphere reserve since 2017, and its concentration of mangrove, lagoon and floodplain habitats along the Mono river mouth. The protected zone also stands out for the scale of the human population it integrates into its conservation framework, approaching two million people whose livelihoods are tied directly to the reserve's landscapes.