Organisers hope to plant more than five million seagrass seeds off the Welsh coastline by the end of 2026.
The project has received a £1m grant from the National Lottery Heritage Fund and in December was granted a marine licence to conduct restoration trials.
Beyond creating a habitat for marine species, the project's organisers hope that communities will be protected from the effects of coastal erosion, flooding and poor water quality.Julie Rostan, ocean recovery advocacy and policy manager at WWF Cymru, said:"The UK has lost up to 92% of its seagrass in the last century.
"It is vital that we bring this important habitat back to Welsh seas so it can help us mitigate the impact of climate change and restore marine wildlife. "We are excited to get started on the planting in Penychain this week with the local community who are at the heart of the project's design and delivery.
"This restoration programme is hugely significant as it will act as a blueprint for future seagrass restoration across the UK and globally".
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