The UK's largest man-made wetland is being developed with the deliberate breaching of 300m of sea wall.
Created at Wallasea Island, Essex, the £7.5m government project has created a 115-hectare wetland, hailed as one of Europe's most significant.
It aims to replace bird habitats lost to development, improve flood defences, and create leisure opportunities.
Biodiversity Minister Barry Gardiner said it addresses "wildlife, flood management, landscape and people" need.
"Saltmarsh is more rare than rainforest, and is important to people, particularly as a flood and storm defence, and to wildlife, " said Mr Gardiner, of the Department for Environment, Food and Rural Affairs (Defra).
'Gradually displaced'
"Hundreds of thousands of wetland birds rely entirely on the Essex saltmarsh for their food each winter.
"Wallasea Wetlands will be a wonderful feeding and roosting habitat for birds like oystercatchers, avocets and little terns, which have been gradually displaced from the area during the last 50 years, as well as creating a haven for other rare wildlife."
He said the wetlands will provide flood defence by taking the energy out of waves as they pass over the area.
"The new sea defences will provide better protection than the old ones, which were in very poor condition."
It is hoped the wetland will also provide for better fish nurseries.
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