Cemlyn Bay and lagoon, Nature reserve and lagoon on the northern coast of Anglesey, Wales.
Cemlyn Bay and the lagoon form a coastal habitat on Anglesey's northern edge, with shallow water separated from the sea by a prominent shingle ridge. The site contains brackish and saltwater zones that create varied habitats for plants and animals.
The reserve was established in 1971 under National Trust protection, which manages the land today. The lagoon has served as a protected coastal ecosystem supporting bird colonies across many decades.
The site serves as a critical stopover for migratory birds and waterfowl traveling through the region. Visitors come to watch and identify different species as they pass through the seasons.
Walking paths circle the lagoon with some elevated viewpoints for bird watching. Visitors should stay on marked routes and respect closed nesting areas during breeding months.
This is Wales only breeding site for Sandwich terns, attracting these seabirds in large numbers each year. The shallow waters and shingle peninsula provide the specific conditions they need for nesting colonies.
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