A Donegal highland from the recording of Fidil. They inform that this tune "comes from the Drimarone area of Donegal, located at the foot of the Bluestack mountains near Mountcharles. It comes from the playing of Charlie O’Neill, originally from Drimarone, now residing in The Moy, Co. Tyrone. It was one of three tunes that were played together for dancing in the area, simply known as The Bluestack Set."
It was actually Dessie Wilkinson that brought this tune to my attention: https://www.youtube.com/watch?v=qfzv5pm6rVg
His version is a bit different, but still the same tune associated with the same source.