Bardsey Island (Ynys Enlli) lies across the Sound about two miles (about 3km) off the tip of the Llŷn Peninsula in North Wales.
It is 1.5 miles (2.5km) in length and, at its widest point, it is just over half a mile (1km) across. The mountain, Mynydd Enlli, rises to a height of 167m. It covers an area of 180 hectares, most of which is farmed.
The island was bought by the Bardsey Island Trust in 1979.
It is managed by the Trust in conjunction with the Countryside Council for Wales and CADW. Bardsey is a National Nature Reserve, Site of Special Scientific Interest and part of the Llyn Environmentally Sensitive Area.
