Here are all recorded ogham stone locations across the whole of Ireland. The map is populated with a combination of National Monument Service data (Republic of Ireland) and Department for Communities data for Northern Ireland. The map was built using some PowerQuery transformations and then designed in QGIS.
The data for Northern Ireland required a bit of filtering so might be a little off. Welcome thoughts on whether there's anything that is missing.
For those not familiar with ogham stones, they are helpfully defined by the National Monument Service as: “upright monoliths or recumbent slabs, onto which ogham script has been incised. Ogham script consists of groups of 1-5 parallel lines and notches cut along the side or across the edge of a stone to represent the sounds of the Irish language. It is usually read up the left angle. The inscription gives a person's name (usually male) and immediate antecedent/s or tribal ancestor. The stones may have functioned as memorials, grave markers or territorial markers and date from the late 4th to the early 8th century AD.”
There were likely many other ogham inscriptions on wood and other perishable materials, but this shows just those on stone. For more background and an interactive map on ogham stone inscriptions, you can see here.
I previously mapped a bunch of other ancient monument types, the latest being stone circles across Ireland.
Any thoughts about the map or insights would be very welcome.