Located on Mahee Island in Strangford Lough, Nendrum is one of Northern Ireland’s most intriguing early Christian sites. Thought to have been founded in the 5th century by St Mochaoi, the monastic settlement thrived beside the lough’s calm waters for centuries.

The site features three concentric stone enclosures, the ruins of a church, a graveyard, a sundial, and the remains of a round tower. These ancient foundations give visitors a real sense of the layout and scale of this early monastic community. One of Nendrum’s most remarkable features is its early tidal mill, an ingenious example of medieval engineering that once harnessed the waters of the lough.

A short walk along the causeway to Mahee Island feels like stepping back in time. Surrounded by views across the lough and to the distant shore, the site has a peaceful, reflective atmosphere. It’s a favourite spot for history enthusiasts, photographers, and walkers who want to combine archaeology with the natural beauty of Strangford Lough.