Errigal is a Hewitt of 747 m in Donegal. It is the highest of the 9 register hills recorded in Donegal; the next is Slieve Snaght (Donegal, B923148) at 679 m, 68 m lower.
Nothing higher stands within 139.5 km; the nearest higher summit is Nephin (806 m), to the south-west. It is also on the county tops list, as the highest point of its historic county. In the database's Derryveagh, Glendowan region it is the highest of five register hills, above Slieve Snaght (Donegal, B923148) and three others. The key col lies 112.2 km away to the south-east, at 66 m. Its drop of 681 m is 91% of its height: the col linking it to higher ground is only 66 m above sea level. It overtops all four of its nearest neighbours; the tallest of them, Slieve Snaght (Donegal, B923148), reaches 679 m. On the Hewitts height ladder it sits between Yr Aran (747.2 m) and Slieve Binnian (745.9 m). The highest point is recorded as rock, not a cairn.
