the online version of the Database of British and Irish Hills
Click on the regions on the map to zoom in and locate the mountains.
The regions, with their names and numbering are taken from The Hewitts and Marilyns of Ireland by E D "Clem" Clements.
A Dillon is a hill in Ireland over 2000 feet (610m) which appears in Paddy Dillon's book, The Mountains of Ireland. There
is no criterion for re-ascent (drop), so it is subjective list with a small number of differences between the Dillons and Hewitts.