Donagh Cross (or St. Patrick's Cross) is situated outside the walls of Donagh Church. Dating back to the 7th century this would make it one of the very early Christian crosses outside mainland Europe. The cross is beautifully decorated with carvings which at the same time reflect the Christian traditions with biblical reference and also the older Celtic art of interlacing patterns (their meaning obscured now through time). This suggests again the success achieved in converting the Irish from a Druid based religion to Christianity, in the adoption of the stones which were held in reverence since early times. Located just beside the cross are two distinctive pillar stones again displaying a great deal of skill in the detailed carving which cover the surface of each of these stones.

The Donagh Cross is of national importance and only for the strong will of a number of local people it may have never returned from a proposed journey to Dublin for a Rosc exhibition a number of years ago. The Cross was originally located in a field on the other side of the road, from where it was moved during road widening works a number of years back. The Cross has suffered from weathering and erosion over the years and as a result has recently been removed by the Office of Public Works for conservation work to Drumahair, Co. Leitrim. This work is now completed and hopefully will mean that this wonderful monument will still be visible for many years to come.

Take the road for Derry and about a mile from Carndonagh is Cashel.