Tre'r Ceiri Hill Fort

This is an Iron Age hill fort on the east summit of the three peaks of Yr Iefl. It covers an area of about 950 feet by 340 feet with as many as 150 hut circles. The earliest fort enclosed an Early Bronze Age cairn and the site was also occupied into the Romano British period. The site is located between Llithfaen and Llanaelhaearn of the B4417 on the Llen Peninsula.