The reserve supports one of the most important breeding colonies of choughs in the United Kingdom.
During the breeding season, high-definition cameras capture live footage of cliff-nesting birds displayed inside the visitor center.
The cliffs are composed of Precambrian metamorphic rock, primarily schist and gneiss, some of which dates back over 500 million years.
The South Stack lighthouse, built in 1809, was designed to guide ships through the hazardous Irish Sea and the surrounding rocky coastline.
The heathland habitat is carefully managed through controlled grazing to prevent encroachment of gorse and bracken.
RSPB South Stack Cliffs is a coastal nature reserve located on the northwestern tip of Holy Island, Anglesey. The reserve encompasses 300 hectares of heathland and precipitous sea cliffs. It serves as a vital nesting ground for thousands of seabirds, including guillemots, razorbills, and puffins. The site is characterized by its dramatic rock formations and the historic South Stack lighthouse situated on an offshore islet. Visitors follow clifftop trails to observe nesting colonies during the spring and summer breeding season. The reserve is part of a designated Special Protection Area due to its significance for choughs. Information and viewing equipment are available at the site’s dedicated visitor center.
The viewpoint near the visitor center provides a clear vantage point of the lighthouse and the cliff-nesting seabird colonies.
Bring high-quality binoculars, as many nesting sites are located at a distance on the vertical cliff faces.
Check the weather forecast before arrival, as wind speeds on the exposed cliffs can be significantly higher than inland areas.
Use the onsite visitor center to check the daily 'what to see' board for current bird activity and sightings.
Attempting to climb down the cliff faces or venturing off marked paths for better views, as this is dangerous and disturbs the wildlife.
The visitor center may have reduced staffing or limited facility access during mid-winter months.
Keep to marked paths to avoid disturbing nesting birds and protect the fragile cliffside vegetation; keep dogs on short leads.
