This is a really interesting place and it's only a few miles outside Letterkenny. The church is very ruined, but in the graveyard there is a large flat-topped stone platform with a lot of grave and cross slabs either lying on the surface or standing up on it.
There are large ones that would have stood over 1m high and some smaller ones just 50cm or tall. My favourite has to be the one with the outline of a person on it. There is also a lovely broken cross pillar similar to those found at Glencolmcille.
A sign by the platform says that the site dates to the 7th Century and was founded by St. Fiachrius and that there's a holy well nearby (which we didn't see). One of the slabs is reputed to be the grave marker of Godfrey O'Donnell who died in 1256.
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This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.
Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.
Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.
The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.
UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.
ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.