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| Erith Marshes | |
|---|---|
| Name | Erith Marshes |
| Location | London Borough of Bexley; Greater London; England |
| Grid ref | TQ515765 |
| Area | c. 53 hectares |
| Managing authority | London Wildlife Trust; Thames Water; London Borough of Bexley |
| Designation | Local Nature Reserve; Site of Metropolitan Importance for Nature Conservation |
Erith Marshes Erith Marshes is a coastal marshland and Local Nature Reserve on the south bank of the River Thames in the London Borough of Bexley, England. The site lies between industrial areas and suburban districts, adjacent to transport corridors including the A2016 road and the North Kent Line, and is managed for wildlife by a partnership of local and regional bodies including the London Wildlife Trust and Thames Water. Historically shaped by tidal action, reclamation, and industrial development linked to the Port of London and the River Thames floodplain, the marshes are a remnant of the once-extensive North Kent marshes system.
The marshes occupy low-lying terrain along the south bank of the River Thames between the towns of Erith and Slade Green, within the administrative area of the London Borough of Bexley and adjacent to the boundary with the Royal Borough of Greenwich. The site is bounded by transport and industrial infrastructure including the A2016 road, the South Eastern Main Line, the North Kent Line, and the Crossness Sewage Works. Nearby urban centres and landmarks include Dartford, Bexleyheath, Crayford, Belvedere, Thamesmead, and the Queen Elizabeth II Bridge at Dartford Crossing. The marshes sit within the Greater London region and form part of the tidal floodplain influenced by the Thames Estuary and the North Sea.
The area was part of the historic Kent marshes mentioned in medieval records under the jurisdiction of Hundred courts and influenced by estates such as those of the Crown Estate and local manors. From the early modern period the marshes were affected by land reclamation and salt marsh conversion related to the expansion of the Port of London and associated industries including shipbuilding at nearby yards and timber processing. In the 19th century the construction of railways like the North Kent Line and industrial works such as Crossness Pumping Station and Beckton Gasworks transformed the landscape. Twentieth-century developments, including wartime infrastructure related to World War II and postwar urban expansion for schemes linked to the Greater London Plan and the London Docklands Development Corporation, further reduced marshland extent. Conservation recognition grew with the rise of urban ecology movements and statutory designations such as Local Nature Reserve status influenced by organisations like the London Wildlife Trust and the Nature Conservancy Council.
The marshes support saline and brackish habitats characteristic of tidal floodplains, including reedbed, saltmarsh, wet grassland, and scrub. Avifauna recorded on the site include passage and wintering species associated with the Thames Estuary such as redshank, lapwing, curlew, kingfisher, and little egret, and migrant passerines linked to the East Atlantic Flyway. The marshes are important for invertebrates including specialist dipterans, coleopterans, and lepidopterans recorded in surveys by the London Natural History Society and the Royal Society for the Protection of Birds. Plant communities feature salt-tolerant species such as sea aster, glasswort, and marsh grasses, alongside reedbed species including Phragmites australis and associated bryophyte assemblages. The mosaic habitat also supports amphibians like the common frog and reptiles recorded by local herpetological groups, while mammals observed in the area include water vole recovery records and urban-adapted species such as European hedgehog and red fox.
Conservation and management are led through partnerships involving the London Wildlife Trust, the London Borough of Bexley, Thames Water, and statutory bodies such as Natural England. Management actions focus on reedbed cutting regimes, invasive species control targeting plants like Japanese knotweed and animal invaders monitored by the Environment Agency, water level management, and habitat restoration to enhance tidal connectivity with the River Thames and the Thames Estuary for estuarine species. The site benefits from biodiversity monitoring by organisations such as the British Trust for Ornithology, the Royal Entomological Society, and volunteer groups including local Friends of the Earth branches and community conservation projects. Funding and policy support derive from sources including the Heritage Lottery Fund, local authority biodiversity action plans, and regional programmes overseen by bodies such as the Greater London Authority.
Public access to the marshes is provided via footpaths and designated viewpoints with links to nearby transport hubs including Erith railway station and local bus routes serving Bexleyheath and Dartford. Formal trails connect to riverside promenades and cycle routes forming part of the Thames Path and local greenways promoted by the Sustrans network. Recreational uses emphasise low-impact activities such as birdwatching supported by hides and interpretation panels installed by local groups, educational visits run with schools and colleges like Bexley College, and guided walks organised by organisations including the London Wildlife Trust and local naturalist societies.
Key threats include habitat fragmentation from industrial redevelopment linked to the Port of London Authority activities, pollution incidents from urban runoff and historic industrial contaminants associated with sites like Crossness Sewage Works and legacy landfills, and invasive non-native species managed under regulations involving the Environment Agency and Natural England. Climate change-driven sea level rise and increased storm surge frequency pose long-term risks tied to regional strategies such as the Thames Estuary 2100 Plan and flood defence works by the Environment Agency and Port of London Authority. Urban pressures from residential and transport infrastructure expansion near Bexleyheath, Slade Green, and the Dartford Crossing continue to challenge connectivity and ecological resilience, prompting integrated responses from conservation NGOs, statutory agencies, and local communities.
Category:Nature reserves in the London Borough of Bexley Category:Wetlands of England