10 May, World Migratory Bird Day -The Berg River Estuary, a shimmering ribbon of life on South Africa’s west coast, is more than just a scenic wetland—it’s a lifeline for thousands of migratory birds and a critical engine for biodiversity. But this vital ecosystem, like many estuaries in the Western Cape, is under increasing pressure from development, pollution and neglect. BirdLife South Africa is calling for urgent, collaborative action to safeguard these threatened ecological treasures.
Estuaries—where freshwater rivers meet the sea—are among the most productive habitats on Earth. In the Western Cape alone, 54 estuaries thread their way along the coast, supporting rich plant and animal life. But perhaps most astonishing is the role these estuaries play in global bird migration. Each year, they host tens of thousands of Palearctic migrants—birds that travel epic distances from northern Europe and Asia along the African-Eurasian Flyway to escape the harsh boreal winter. Among them are iconic species like the Common Whimbrel and Curlew Sandpiper, their journeys spanning continents to find sanctuary in these nutrient-rich waters.
Feature image: Aerial view of the lower Berg River Estuary. BirdLife South Africa, RSPB and IAS.
A Global Migration Hotspot
The Berg River Estuary stands out as one of the most vital sites along this migratory route. Recognised as a Key Biodiversity Area (KBA) and listed as a Ramsar wetland of international importance, the estuary provides a feeding and resting haven for over 25,000 waterbirds. Some of these, like the Red Knot and Bar-tailed Godwit, have been recorded flying non-stop for thousands of kilometres to reach its shores.
“Estuaries like the Berg aren’t just havens for birds – they are among South Africa’s most productive ecosystems,” says Dr Giselle Murison, Western Cape Estuaries Project Manager at BirdLife South Africa. “They provide critical nursery habitats for fish, buffer against floods, filter pollutants, store significant amounts of blue carbon, and support the livelihoods of many South Africans.”
Mounting Pressures
Despite their importance, less than 2% of South Africa’s estuarine areas may be considered well protected. The Berg River is increasingly impacted by:
- Upstream water abstraction
- Agricultural and industrial pollution
- Urban encroachment
These pressures are altering water flow and degrading habitats essential to birds and aquatic life.
A Strategic Conservation Approach
BirdLife South Africa’s Western Cape Estuaries Conservation Project, supported by the Western Cape Government, is tackling growing threats to our estuaries by focusing on:
- Better protection and management of estuaries that are key to conservation.
- Restoring damaged estuarine habitats, especially vital blue and teal carbon ecosystems.
- Bringing estuarine conservation into planning and policy, where it’s often overlooked.
- Boosting research and monitoring to guide smarter, more effective management.
- Working closely with local communities and stakeholders to raise awareness about the value of estuaries—for biodiversity, livelihoods, and the services they provide.
Part of a Global Network
The Berg River Estuary is an important site in the East Atlantic Flyway Network—a chain of key wetland sites stretching from the Arctic to southern Africa. This places the estuary on the map as a critical stopover for migratory birds and unlocks opportunities for international collaboration, funding, and research.
Local engagement is also ramping up. Citizen science initiatives and estuary forums are encouraging communities to take an active role in monitoring and protecting these habitats. From bird counts to water quality sampling, ordinary people are becoming guardians of these extraordinary places.
At the Berg River, one of the first examples of an estuarine-focused Protected Environment is underway. Almost 7,000ha in size, it will secure more than 1,000 ha of valuable estuarine floodplain, alongside threatened fynbos and strandveld – all because the landowners in question have entered into stewardship. This will be the first formal protection for the Berg River estuary.
Still, challenges remain. Climate change is altering rainfall patterns and sea levels, placing further stress on already vulnerable systems. As the pressure mounts, conservationists are urging greater urgency from both the public and private sectors.
“There’s an urgent need to shift from recognition to action if we are to secure the future of the Berg River and other estuaries in South Africa,” says Murison. “We know these ecosystems are severely underprotected and overexploited. Losing them would not only be a blow to biodiversity—it would erode the ecological resilience and sustainability of entire communities that depend on them.”
For now, the Berg River Estuary remains a haven—a place where flamingos stalk the shallows and the calls of distant migrants echo across the mudflats. But whether it stays that way will depend on what we do today.
