Church Island, also known as Llandysilio Island,[1] (Welsh: Ynys Tysilio) is a small island in the Menai Strait on the shores of Anglesey to which it is attached by a short causeway that is reachable only on foot. The dominant feature of the island is with St Tysilio's Church, constructed in the 15th century, its churchyard, and a grade-II listed war memorial. The 20th-century bard Cynan (Albert Evans-Jones) is among several notable people buried in the churchyard. The Anglesey Coastal Path passes the head of the causeway.
A number of birds inhabit the island and its waters, and it also features numerous primroses.